| Re: [GMCnet] Oil WARS ( again) [message #163899 is a reply to message #163890] |
Thu, 22 March 2012 20:03   |
JohnL455
Messages: 4447
Registered: October 2006
Location: Woodstock, IL
Karma:
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Senior Member |
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Most likely a broken-in flat hyd cam will be fine with even then SN oils now on the shelf provided you run stock valve spring pressures, and a non insane cam profie (most MH grinds are not) The way I understand SM to SN update did not lower ZDDP but made other improvements. Though ZDDP is lower these days, there are other additives in the newer oils that can act as friction modifiers. What it really comes down to is spring pressures and how agressive the cam is and if you have a muliplier in the rocker (higher lifter foot pressures). Or if the lifters and /or cam are offshore junk. All that said staying around 1200 PPM is cheap insurance and not so much necessary on the road, but our vehicles have a more severe wear issue after long (months) oil drain down periods between starts. This is where it may help. Again, owning a GMC is like owning a horse----everyone has a different twist on how to maintain. Just MHO.
John Lebetski
Woodstock, IL
77 Eleganza II
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