This tag should be used for anything related to the use of automotive engine oil, or in reference to other parts of the car that also require lubrication using oil.

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9
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4answers
2k views

How do I tell if I screwed up my oil change?

I just changed my oil in my 2500 HD Silverado for the first time by myself. I've changed my oil in a 2004 Toyota Camry a handful of times, but I always had a friend supervise me. I need to know common ...
3
votes
1answer
29 views

Oil light is always on (2006 golf 1,4i)

The oil light is always on in my 2006 VW Golf 1.4i. I have tried changing the oil pump, oil switch, and even putting more oil in, but the light remains on.
15
votes
4answers
4k views

What actually happens when there is way too much oil in a car engine?

I saw the answers to a question I posted recently highlighting the disadvantages of having too little oil in an engine, but that got me wondering what if the complete opposite were to occur! I know ...
9
votes
4answers
12k views

Is the vent from the pcv valve back into the air intake really needed?

After working on my car, I didn't bother to reattached the line from the pcv valve into the air intake before testing the motor. It ran normally. This made me question whether I need to even return it ...
3
votes
1answer
26 views

Drove with extremely low oil, engine light on [duplicate]

I drive a 2011 Honda Odyssey. The last time I had my oil changed, they neglected to reset the oil change indicator (relevant because I'm assuming it would have come back on sooner when my oil level ...
35
votes
9answers
85k views

What actually happens when there is not enough oil in a car engine?

When a car is topped up with oil, it clear to most people that you are supposed to fill it to the recommended amount as specified by the manufacturer (normally on a dip stick). What exactly are all ...
21
votes
7answers
92k views

What are the risks of overfilling a small engine with oil?

I recently overfilled a 4 stroke lawnmower engine with oil. It has been run for about 1.5 hours while overfilled. It smokes a lot right after being started but after 30 seconds or so the smoke clears. ...
11
votes
4answers
4k views

What happens if unsuitable oil is used in a vehicle engine?

I recently heard an urban legend-like story about a guy in a developing country who decided engine oil was too expensive and so used some vegetable oil instead. The story says the car ran for some ...
4
votes
1answer
63 views

Running in oil a for light diesel engine (Japanese, Toyota 3L)?

What would you use as a running in (break-in) oil for this engine? I have this engine, and it has just been reconditioned, new pistons, conrods, crank and bearings.
5
votes
3answers
16k views

Which provides better engine flushing, traditional flushing oil or adding a flush additive to old oil?

Background I think that my vehicle would probably benefit from having it's lubrication system being flushed out at it's next oil change. Checking prices of flushing oil at local suppliers I noticed ...
6
votes
2answers
28k views

Accidentally poured engine oil into the coolant reservoir

My 1990 Mazda 626 leaks oil like a sieve, so I regularly top up the oil. In a moment of stupidity, I opened my radiator cap instead of my oil cap while topping up my engine oil, and poured about 50-...
5
votes
2answers
75 views

8-9 Quarts of oil in engine after adding a stupidly high amount. What kind of damage can I expect?

To preface this, I was a complete idiot. My 2002 Honda Accord was a couple thousand miles over the recommended oil-change period and I was being pestered about checking the oil, as it could be fairly ...
15
votes
4answers
317k views

Will Putting An Extra Quart of Oil In My Car Ruin It?

I put too much motor oil in my car's motor. About a quart - have I ruined my car? I've been driving it. I know I need to get the oil drained. But I'm worried that I've ruined my car which has been ...
7
votes
3answers
624 views

Okay to add new oil to old?

Title pretty much explains, I change my oil every 4-6k miles depending on how generous I’m feeling, however will the oil dirty oil that’s already in the sump mix with the clean oil when topping up? ...
11
votes
1answer
177 views

If you change your oil with synthetic can you never safely go back to using conventional?

I know that sounds like a weird question but I was talking to my brother in law about oil changes and I mentioned that I almost always use Mobil 1 full synthetic. He replied, "make sure you keep ...
6
votes
1answer
83 views

Can low gear oil cause a syncronizer not to work?

I've been having a problem for a while on my MTX Nissan Almera with only being able to engage fifth gear at specific speeds, around 68-72 km/h. I recently noticed while changing an inner tie rod dust ...
3
votes
0answers
27 views

Diagnosing oil consumption on Nissan VQ35DE (350z / G35)

I have a 2004 Infiniti G35 6MT coupe. Nissan VQ35DE engine with a bit over 156,000 KMs (about 96,000 miles). Since I bought it, I've noticed some oil consumption at a rate of about a litre every 4,...
3
votes
3answers
3k views

Massive oil drop in the course of a few days

A few days ago i posted a question about the dealer reporting some oil spillage/leakage but that it passed the mechanical test. I checked the oil level of the car from my 80 minute drive home and it ...
7
votes
3answers
13k views

How to understand different engine oils?

When I went to shop for engine oil, I found many types as such: 5W-30 A5 5W-30 A1 5W-20 SAE 5W-30 10W-30 Also I see other information such as: Fully Synthetic Semi Synthetic Oil Synthetic ...
6
votes
3answers
8k views

Ticking noise when accelerating

I have a Vauxhall Corsa "C" (2003)(EU) which is a standard 16v 1.2 petrol, the engine is chain driven and sits at 50k. I don't think it was well looked after (service wise) in previous lifes. ...
7
votes
1answer
69 views

Does R-134A refrigerant normally have oil (liquid at room temperature) in it?

Upon [legally] releasing some pressure from a car's (model year 2000) over-charged AC refrigerant loop that uses R-134A refrigerant, some of the released fluid surprisingly stayed liquid at room ...
1
vote
1answer
38 views

Checking oil on a newly-aquired used motorbike

I've recently bought a used motorbike and am unsure of how to gauge the age/condition of its oil: Neither did I fill the oil in the first place (so I don't know what colour it used to be) nor have I ...
5
votes
1answer
120 views

Is it safe to run a car with the oil level above max?

I drive an opel/vauxhall insignia. Often when i come to check the oil i find the oil level is above the max rating, I believe the oil level is also somehow raising (possible diesel slipping past the ...
6
votes
3answers
2k views

What do the numbers on motor oil specifications mean?

What do the numbers and letters in a motor oil specification mean? For example: 0w-30 5w-40 10w-20 Which values are better? Also, sometimes there are additional letters and numbers ...
19
votes
6answers
33k views

Is it OK to mix oil of different viscosity in a Wankel engine?

I have a Mazda RX-8 (with a Wankel rotary engine). Mazda advises North American owners to use 5W-20 oil. The engine was just replaced 200 miles ago by the dealer so it currently has 5W-20 in it. ...
0
votes
0answers
21 views

Excess oil in car engine [duplicate]

Mechanic changd the oil filter forgot to drain the old oil and continued to add the new oil So basically the engine has double the capacity of oil Will this caise damage to the engine
5
votes
1answer
338 views

2011 Jeep Liberty ran without oil, did this cause my engine to blow?

I have a 2011 Jeep Liberty and the oil pan rusted out and it was driven for a while without oil. The oil pan was fixed a couple days later. This happened in April 2014, in Oct 2014 the engine started ...
3
votes
1answer
54 views

Is a greasy exterior a sign of bad maintenance?

All car's I've had (second hand and between 15-30 years old) have always had a greasy veil over engine components. I understand moving components need to be lubricated but this gives off the ...
0
votes
1answer
40 views

A quart to much oil in my Toyota 4 runner 2001 [duplicate]

I put a quart to much oil in my Toyota 4 runner 2001. Then I went for a road trip! I noticed oil coming out the back of my car! And now I am hearing a noise! Ut oh!! Did I ruin my engine?
5
votes
3answers
133 views

Oil burning: differenciate between bad valve seals or piston rings

My Toyota Vitz 2007 burns engine oil. I replaced the PCV valve but it didn't help. As per the answer to my previous question, this could be either due to bad piston rings or bad valve seals. What ...
0
votes
2answers
61 views

Safe Vehicle Operating Temperature while towing

I have a F-350 Dually that is capable of towing 16,000lbs. I regularly pull 14-15K lbs. I have a programmer that gives me a digital display of both my EOT and my ECT. What would you say is the ...
4
votes
3answers
5k views

Lots of oil in radiator, but no coolant in oil and oil is not low

Theres oil in the radiator and the overflow tank of my 2002 GMC Envoy. The oil is fine, and has no water in it. The SUV gets regular oil changes, and the oil presure is fine. Water temperature is ...
2
votes
3answers
1k views

TVS Apache RTR 160 - What Grade Engine Oil Should I Use?

I bought a TVS Apache RTR 160 second hand. I want to know what grade engine oil should i use for my bike. I was suggested to use 15W50. Is that a good choice. The bike has done almost 65000Kms.
3
votes
2answers
72 views

Oil low - incorrect oil already in. Stick with the wrong type or add correct type? [duplicate]

Vehicle: 2004 Mini Cooper (1598cc Petrol, 3-door hatchback) (United Kingdom). My knowledge-level: Low. Background: My oil level is below 'minimum'. I suspect a leak and have booked it into the ...
18
votes
4answers
2k views

How can an oil plug just fall out after three months and 3,000 miles and the car has just 35,000 miles on it, 2014 Ford Escape

We had an oil change done at a quick lube type shop. After nearly 3 months and 3,000 miles driven, the oil drain plug fell out, resulting in blowing up the entire engine. There was no oil leakage or ...
3
votes
4answers
348 views

Hyper-miling and stress on engine oil

The other time I asked my mechanic, are my tires about needing to be changed? He said, naw, another 8000 miles. After driving 7000 miles, I asked another mechanic who again said, long way to go. ...
5
votes
4answers
5k views

How could an oil drain plug fall out after 36 days and 2500 miles?

We had an oil change done at a quick lube type shop. After 36 days and 2500 miles driven, the oil drain plug fell out, resulting in severe engine damage. There was no oil leakage or any sign of ...
7
votes
3answers
157 views

Excessively over filled motor oil. Ran for a few seconds until smoke came out. Now my car won't start

So last night me and a friend changed the oil on my 2005 Chevy aveo. The only problem was that what we were draining was the transmission fluid and long story short we ended up adding about 6 litres ...
6
votes
4answers
916 views

High oil warning in Mercedes B class diesel

I have a Mercedes B class diesel 2010. I have had it since August 2015 from a dealer who serviced it, and everything is running fine. I have noticed a warning saying drop oil level, so I measured the ...
5
votes
2answers
96 views

Fixing a gasket oil/transmission fluid leak with epoxy glue - possible reaction with oil?

I'm in Sierra Leone where mechanics have an impressive flair for improvising with limited resources, but a lack of formal training and a cavalier attitude to long term safety. I've had a transmission ...
8
votes
2answers
455 views

How to test if oil is leaking into combustion chambers?

How can I test whether oil is leaking into cylinder combustion chambers and getting burnt in case of oil level loss? As opposed to, for example, leaking through the oil pan or the timing chain cover.
16
votes
3answers
8k views

Is it worth switching to full synthetic or blend oil in my older car/truck?

I have a older (enter vehicle here) that has 100k miles on it. Would I see any benefit switching to full synthetic or synthentic blend oil? Is it worth the extra cost in an older vehicle? For ...
2
votes
1answer
67 views

2006 Ford Fusion - High Oil Consumption

My 2006 Ford Fusion (4 cylinder, manual transmission) is using a lot of oil. 1 qt every 300 miles. No smoke, no oil spots under the car on the garage floor. Where could the oil be going?
12
votes
2answers
1k views

Does Vaseline dissolve rubber?

Recently, someone suggested that I apply some vaseline to an O-ring connection to see if I can find a leak. I've read that oil-based lubricants, especially vaseline, can desolve rubber. It seems like ...
16
votes
3answers
1k views

Why has my car burnt through all the oil?

I have recently run in to trouble with my Vauxhall Corsa 1.2 2013. I broke down the other day after a huge cloud of white smoke out the exhaust followed by a severe loss of power. The AA came had a ...
3
votes
1answer
93 views

Does the oil level in my Pulsar 220 FI change the engine sound?

I own a 2009 Pulsar 220 FI. When the engine is cold, the sound of the engine is pleasant. But when I run a few kilometers, the sound becomes harsh. I read that when engine oil gets hot the oil flows ...
7
votes
2answers
90 views

How do I remove oil sludge from an installed engine?

What's the preferred, non-chemical/non-additive method for removing oil sludge from an engine that's still installed in the vehicle? I'll have the head and oil pan removed. How do I clean out the ...
5
votes
1answer
63 views

Motor blown after first oil change of the season after sitting all winter

My teenage son bought himself a D105 tractor several years ago. After the winter, he pushed it onto our driveway, and we completed an oil change and lube. Afterwards, he started up the tractor, drove ...
4
votes
1answer
179 views

I've got oil in my coolant but no coolant in the oil - Ford Triton V10 Motorhome

I have a Triton v10 engine in my vehicle I have oil in my coolant but no coolant in the oil. What could be the problem?
3
votes
0answers
28 views

My 05 F150 engine knocking

Drove it - reached destination and started knocking - NO oil on dipstick. Put in 5 quarts of oil - ran fine until reached next destination - started knocking again - oil was present this time - drove ...