“I have used Valvoline 20/50 for over 70000 miles in a Sunbeam Tiger V8. Oil changed every year.
Oil pressure has stayed excalty the same over this period, including many European trips to hot countries.
Also in my Jaguar Etype 4.2 since purchase 2 years ago. A superb oil for classic cars.”
“I'm using this oil in a Series 1 e-type Jaguar. So far the oil pressure when the engine is hot is some 10-20 PSI higher than with an equivilent mineral oil 20/50. Very pleased so far!”
