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I have a set of 4 Pirelli P7 AS Plus tires that I use on a FWD vehicle in the summer. They have about 8/32 tread left and are manufactured in 2018. One of them is damaged due to road debris. Would you replace 2 or all 4?

It was reported over 5 years ago that Tesla's electronic door mechanism may not release in the event of a crash trapping people inside the car. We had another 4 people die because they couldn't exit a burning Tesla...

I've seen people claim that using too thin oil will wear your cams, bearings, or cylinder walls. It was interesting to hear the different theories where thickness is most critical. I think the only consensus is that the timing chain doesn't care too much about viscosity. If you use too thin oil...

Is it harmful to put ducktape on the tire tread? When doing the winter changeover I started putting a piece of ducktape on the tread where I write with permanent marker which wheel the tire came from. When it is time to change back I peel off the ducktape. There is some residue remaining, but...

A lot of people have speculated why OEMs use such low efficiency filters. Could it be due to CAFE? If a filter has high restriction, it will place an extra load on the oil pump and the engine. For maximum performance, you will have the lowest resistance to flow, so you need to sacrifice...

This is a question for the guys who have pristine daily drivers, constantly changing oil, changing atf every 15 miles, brake fluid fluid flushes ever 2 years, changing coolant and ps every 30k, etc. Changing good parts for preventative maintenance. Is your house also maintained to the same...

When the topic of HPL comes up a lot of people say you must run long drain intervals to get good value. Why is this the case? You are getting the best oil in the world, that protects under all conditions. Of course there will be a price premium for that. Even when you run short OCIs it will...

From the major oil brands it's been a long time since I've seen someone hyping over Castrol products. I think German Castrol 0W30 is the last time I saw someone excited about Castrol products, which was probably like 10 or 15 years ago. The titanium additive and magnatec looks like it didn't...

I noticed some oils come in 4.73 L (5 quart) jugs and some in 5 L jugs. I assume this is because oils blended in Canada and Europe will use metric? Is this a factor when you are buying oil? If it is the same price, you will get 0.27 L extra with the 5 L jug. I sometimes see 4.4 L. Why do they...

Did Fram downgrade their grip section? There is only ~1 cm of anti-slip coating on this filter. It used to be at least double.

I looked inside my M1 0w20 AFE bottle and this is what I saw. Is this additive precipitation? The bottle was purchased ~1 year ago.

I was doing an oil change and this is what's left of my 2012 Mazda 3 hose clamp. I am planning on replacing these as preventative. Would you do the hose as well? The wet spot is just moisture from undertray btw. I was thinking hoses bursting isn't that common on modern cars, but the rust might...

Is there any good methods to check rotor lateral runout without a gauge? I suspect I have an issue. I had high speed steering wheel vibration at 110+ kmh. When I put my foot over the brake without pressing it I could feel vibration was transmitted to the padal at almost any speed. There was no...

I see a lot of topics on engine break in, but not a lot on the differences on classic vs modern cars. Modern cars are filled with fully formulated synthetic at the factory and driven off the assembly line. If you do this after rebuilding an old engine, the piston rings won't seal properly, so...

I've seen oil experts saying that a low viscosity oil like 0W16 needs a strong additive package to protect against wear. I thought the number one thing to prevent wear is maintaining MOFT? I assume an engine is engineered where 0W16 can comfortably give you MOFT. If MOFT is maintained, why...

I was buying some Mobile 1 and I saw this comparison chart. What I found interesting is that Vanilla M1 is 3 stars for sludge protection and 2 starts for high temperature protection. AFE is inverse of that, 2 stars for sludge protection and 3 starts for high temperature protection. Does AFE...

After changing my oil it feels like performance is reduced for about a week of driving or 500 km. Afterwards it feels like performance is restored. I know this is subjective, so I am asking here to see if someone has more scientific knowledge. I was thinking after you perform an OCI there could...

I will be doing a brake job on 2012 Mazda 3. It has brake calipers made by ATE, which look the same as on many German cars. The sliding pins are partially exposed when everything is installed. German car makers don't recommend greasing these types of pins. Is there any guidance from Mazda...

What do you find most satisfying about changing oil? For me it changed a little bit. I used to love pouring the new oil into the motor and watching the gold liquid go in. Now with 0W20 its over too quickly. I also loved starting up for the first time and hearing the engine run on new oil. I...

When doing an oil service is there any difference between draining the oil when it's cold or draining it when its up to operating temperature? I always made sure the engine is hot, but does it actually make any difference? How about in the winter, when it is cold outside? 0W20 seems to flow...