79 Trans AM - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**WIDESIDE72** · 07-06-2011, 12:57 PM

From personal experience, I have not had any trouble running modern oil in older stock engines. It is when you get into the higher lift and spring pressures of modified enines that you need the ZDDP additives. I lunched a 355 back in the late 90's before everyone knew what the culprit was. The cam went flat about 3k miles after I rebuilt it, ruining the crank. Luckily the piston skirts were OK. I had the crank turned and put a new cam and lifters in it. It is still on a stand, as I installed a 383 with a roller cam in the mean time.

07-06-2011, 12:57 PM	#2
WIDESIDE72 Senior Member Join Date: Aug 2008 Location: Cedar Park, Texas Posts: 7,500	Re: 79 Trans AM From personal experience, I have not had any trouble running modern oil in older stock engines. It is when you get into the higher lift and spring pressures of modified enines that you need the ZDDP additives. I lunched a 355 back in the late 90's before everyone knew what the culprit was. The cam went flat about 3k miles after I rebuilt it, ruining the crank. Luckily the piston skirts were OK. I had the crank turned and put a new cam and lifters in it. It is still on a stand, as I installed a 383 with a roller cam in the mean time.



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