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Discussion Starter · #1 ·
Hey, I've recently changed the motor oil in my 78 to to Syntetic Valvoline 10w 30. The engine has 40000+ (B) miles on it.

I keep thinking I shouldn't have used syntetic on an old engine and I tink I will change the motor oil.

Am I safe to use Syntetic on that engine? The car is driven 30 miles a day 6 days a week with average speeds of 50mphs. Also, what viscocity oil should I use ( I live in Southern AZ)?

Thank You.
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