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Rory McNeil · 05-20-2024, 11:55 PM

Rather than mixing in a ZDDP additive, I prefer to use an oil that has it built in. I have been running Brad Penn/Penngrade 1 10/30 and 5/30 oils in my flat tappet and hydraulic roller stuff for quite a few years now, and have had no cam or lifter issues. Over the years, it appears that the Shell Rotella oil has had the ZDP content reduced more than once.

05-20-2024, 11:55 PM	#9
Rory McNeil VIP Member Join Date: Jun 2007 Location: from Vancouver BC Canada, now in Nova Scotia Posts: 1,311 Likes: 317 Liked 1,104 Times in 302 Posts	Re: Best place to buy Rotella Rather than mixing in a ZDDP additive, I prefer to use an oil that has it built in. I have been running Brad Penn/Penngrade 1 10/30 and 5/30 oils in my flat tappet and hydraulic roller stuff for quite a few years now, and have had no cam or lifter issues. Over the years, it appears that the Shell Rotella oil has had the ZDP content reduced more than once. __________________ NHRA 6390 STK M/S 85 Mustang