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Advice on Motor oil viscosity for 1978 corniche in southern oregon

2K views 4 replies 3 participants last post by  rollsroyceroamer 
#1 ·
Please advise on what viscosity oil would be best for use in 1978 Corniche, mileage 98,000. The climate in this part of country has 4 seasons, winters can have lowest temperature of 32 degrees F at night and 102 is the hottest in summer

Thanks

Rollsroyceroamer
 
#3 ·
If your engine has been completely clean inside, specially the old mude from 40 years oil.....and if it is in excellent condition, then choose a full synthetic 10W40.

If the engine might be dirty inside, no full ynthetic, but half synthetic 10W40
 
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