I have a 1977 XJ6C, which sees less than 1500 miles use per year. It gets a 20-30 mile drive every month at least, to keep the gaskets intact (and for sheer enjoyment). I use Mobil One 5W30, which, needless to say, looks perfectly clean after a year and a half in the engine. Is there any need to change the oil based purely on the time it has been in the engine?
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1999 XJR

 

IMHO you should change it at least once a year as oil can become acidic with use as and will contain condensation unburnt fuel etc.

 

I agree, but being as **** as I am, I would say every six months. Just the short trips driving, startup etc....not great for the oil.

 

DITTO

 

Thanks for the replies, chaps. I will follow your advice.
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1999 XJR

 

If you get it out every month and get it up to temp and run it for 30+ minutes at steady speeds, you will burn off the vast majority of condensation and fuel from start-up. As long as the carbs are in a good state of tune and not running pig rich I would have no issues with 2 years...I'm assuming the car is kept indoors in a climate controlled environment.

 

As cheap as oil is, (sorta speaking)why go the two years?..Every six months is a good measure..But if you burn the gas less..then add the correct amount of Stab-Bil to the gas to keep it fresh.