Originally Posted By: Doug Hillary
I have been using HD lubricants in petrol engines for around 50 years with no adverse results - ever!
I agree. Speaking of ZDDP and HDEOs, Popular Mechanics this month has a little writeup on it because someone asked a question about their old style performance engine failing shortly after rebuild (cam and lifter failure). They indicated that over 1000 ppm of ZDDP was okay, and 1200 ppm would be optimal. They didn't like the notion of an HDEO because of "abrasive" detergents.
If the HDEO meets SM, and your engine needs SM or older and the grade is appropriate, you should be good to go. I haven't heard of anyone ruining a gas engine (or shortening its life, for that matter) by using an appropriately rated HDEO in the appropriate viscosity.
It's a lot easier than poring over a bunch of product data sheets (PM made a mistake and said to check the MSDS, which, to my knowledge, don't say a thing about ZDDP) and then hunting for some obscure oil. It's also a lot cheaper to buy a suitable HDEO (i.e. Rotella or Esso HDEO 10w-30 would work perfectly for most old performance engines) than it is to buy a quality current PCMO and spend a whack of money on nuisance additives.
The old engines are not likely to be subjected to extended OCIs. So, why buy $10 worth of QS SM, for instance, and $10 worth of some ZDDP additive when $10 worth of Rotella or Delvac 1300 would do the trick?
I have been using HD lubricants in petrol engines for around 50 years with no adverse results - ever!
I agree. Speaking of ZDDP and HDEOs, Popular Mechanics this month has a little writeup on it because someone asked a question about their old style performance engine failing shortly after rebuild (cam and lifter failure). They indicated that over 1000 ppm of ZDDP was okay, and 1200 ppm would be optimal. They didn't like the notion of an HDEO because of "abrasive" detergents.
If the HDEO meets SM, and your engine needs SM or older and the grade is appropriate, you should be good to go. I haven't heard of anyone ruining a gas engine (or shortening its life, for that matter) by using an appropriately rated HDEO in the appropriate viscosity.
It's a lot easier than poring over a bunch of product data sheets (PM made a mistake and said to check the MSDS, which, to my knowledge, don't say a thing about ZDDP) and then hunting for some obscure oil. It's also a lot cheaper to buy a suitable HDEO (i.e. Rotella or Esso HDEO 10w-30 would work perfectly for most old performance engines) than it is to buy a quality current PCMO and spend a whack of money on nuisance additives.
The old engines are not likely to be subjected to extended OCIs. So, why buy $10 worth of QS SM, for instance, and $10 worth of some ZDDP additive when $10 worth of Rotella or Delvac 1300 would do the trick?