Technical & General Discussion Area > Tech Torque Pre 1973

oils

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shaunp:

--- Quote from: 66RedRagtop link=topic=10841.msg112606#msg112606 ---Go the Castrol Edge Sport 25W-50, or Penrite HPR40, as both have the required zddp (phosporous/zinc) content to protect our flat tappet engines.

Friends race historic cars on these two oils with no measurable wear after a season.

Strange but Penrite HPR30 is less suitable, being an oil with less zddp content for modern engines.

Running the oil warmer (85C min) rather than cooler gives the best wear protection.
--- End quote ---



This is the correct answer, but HPR 30 is still ok, once the cam is bedded. Just remember the heavier the oil the more HP it uses to pump it around + the slower it is to get around on start up, and if you run a HV pump the harder it is on the drive gear on the cam.

muzz67:
Penrite Classic is there best blend for flat tappet and early engines which need Zinc etc. Any oil that says it is suitable for 'late' model cars is a worry, due in the main to them having to remove all Zinc and the majority of Phosphates to make the Catallytic converters live.

In Penrite Classic you can get light med and heavy, google their website and study for yourself.

Glen Mach 1:
Hi all, I know this is an old post and some of these products are hard to find now.  Just looking for an update on what oil would be best for a 351c runs fine and not rebuild recently in Queensland.

Thanks

Glen Mach 1:
Also how much oil should a 351c take.

Cheers

GLENN 70:
Glenn , 351c Penrite  HPR 30 , 5 litre  with a Z9 oil filter . Put some oil into the filter 1st with some oil around the seal .  Put 4.5 litres in and check level ,but with the new filter  ,  after its run and the cooled back down and checked . Make sure the old seal comes off the block .

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