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Discussion Starter · #1 ·
Ok - I was running Mobil 1 Green 10/30 for 'older cars' and was replenishing 1 quart every 800-900 miles. Still within tolerances according to the manual. I have used this for about 50,000 miles. Oil leaks here and there too, annoying, but whatever.

I decided to try a different weight for the summer heat 15/50 Mobil 1 (now branded extended life) and guess what??? 1/2 quart usage in 2200 miles. Does anyone know why? Is this due solely to the weight of the oil? If so, I'll run this stuff forever!!

Thoughts/technical explanations?

1991 3.6l with 202,100 miles and running strong!
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