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For the initial cleaning phase I ran M1 0w-40, then for the rinse phase I used normal Pennzoil 5w-30. I just changed back to M1 yesterday and the engine is noisier and not as smooth at idle as compared to the dino oil. The performance is excellent though. Should I put in a different synthetic...

My engine has only done this twice, but two times too much. When I start the engine, it makes about four knocking sounds in 1-2 seconds. Like: ta-ta-ta-ta. It occurs when the engine is warm. As I said, it has only happened twice, but most recently today and it has me worried. The oil level is...

I have used Mobil1 0W-30/40 for the lifetime of my car. My OCI's w/ filter are 5K mi. This car sees extended runs (30 - 90 mins) of speeds in excess of 100mph on a regular basis. The car runs pretty well (26 - 35 mpg). The compression doesn't seem too good though: 185-175-165-180. Do you...

Hello all, I have been using Mobil 1 synthetic gear oil in my VW tranny for about 75K miles. I recently changed it because it was getting very difficult to shift gears. I put in the same oil and it shifts pretty good now, although it could be better. I addressed this issue with some people...

Hi guys, I bought a Tohatsu 4 stroke engine with 4 hp and would like to get some feedback on the type of oil I should use. The manual recommends a 10w-30/40 oil that complies with the SF, SG, SH, SJ standards. Is it okay to use Mobil 1 0w-40? For the gear oil it recommends an API GL5 SAE 80...