which oil leaves a longer lasting film?

Status
Not open for further replies.
Originally Posted By: old1
On my classic cars that sit for long periods between uses quite often, does conventional or synthetic leave a longer lasting film for restarting. Or doesn't it matter in the least.

In classic cars I would use an oil with a high x in xW-y, such as 10W-, 15W-, or 20W-, meaning a thick base oil, and a high moly and ZDDP content. This assures best wear protection in classic cars where valvetrain stresses can be unforgiving. Conventional vs. synthetic is probably secondary.
 
Originally Posted By: Gokhan
Originally Posted By: old1
On my classic cars that sit for long periods between uses quite often, does conventional or synthetic leave a longer lasting film for restarting. Or doesn't it matter in the least.

In classic cars I would use an oil with a high x in xW-y, such as 10W-, 15W-, or 20W-, meaning a thick base oil, and a high moly and ZDDP content. This assures best wear protection in classic cars where valvetrain stresses can be unforgiving. Conventional vs. synthetic is probably secondary.

A very good oil for classic cars is Mobil 1 15W-50 -- thick base oil and 1200 ppm phosphorous -- if your car is garaged in severe cold. Mobil 1 oil guide (link) specifically lists it for flat tappets.

You can also use a 10W-40 or 20W-50. 10W-30 is probably fine too but don't use 5W-30, as the base oil is too thin for flat tappets.
 
Status
Not open for further replies.
Back
Top Bottom