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Re: Too old for sythentecic oil?
I ran synthetic for a bit, but my truck burns so much oil I couldn't afford it so I switched back to convetional.
As to the ZDDP (zinc) debate, I did a LOT of research into this, and what I came up with is that the current synthetic oils (Mobil1, etc) have the same level of ZDDP as the oils that it was originally in back in the early 60's. The problems with non-roller motors only developed in the late 60's when they started building factory motors with radical cams and stronger springs.
Simply put, a factory truck motor with a mild cam and non-performance springs could run on the original ZDDP levels, which are THE SAME as the current levels in synthetic oils.
Once I replace my rings and valve seals so it stops burning, my truck is getting Mobil 1. 2cents
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'50 GMC 100 shortbed Gen IV 4.8 LS - 4L65E (Secret truck, Shhh!!!) Build
'63 Buick Wildcat Coupe 401ci Nailhead (Very much in pieces) Photos
'66 Impala SS convertible 327-QJet-glide (4 speed swap one of these days...) Photos
'69 CST/10 4x4 SWB Stepper 350 2bbl - NV4500/NP241C (Broken Truck!)
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'71 Custom/10 2WD LWB fleetside - '72 GMC K/3500 Dually (Sold to redryder)
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