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Late versions of SL/GF-3 oils showed about the same levels of zinc and phosphorus as SM/GF-4 oils, like they were tweaking the formulas to get them good to go before the official SM release.
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SW 99,
Home Depot still has Pennzoil Conventional (SM GF4) in the yellow bottle for 79 cents.
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I wish... My local HD had the dino SL for $1.60'ish and the synthetic was still almost $4 even on clearance.
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M/GF-4 test requirements require less Total Deposits TEOST (MHT4), less viscosity increase after 100 hours (Seq IIIG) versus 80 hours (Seq IIIF), less cam plus lifter wear (Seq IIIG & Seq IVA), and adds an aged oil low temperature viscosity requirement (Seq IIIGA). Add in the Fords specs, for added tests requirements, and you almost assured of better oil.
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427,
But I think you'd agree that SL Havoline is a excellent oil when its under $1 a quart?![]()
I sure do. If my running of SF/SG/SH and beyond got many of my engines to 200k and one to 300k, SL will do it with NO worries IMO.![]()
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427,
But I think you'd agree that SL Havoline is a excellent oil when its under $1 a quart?![]()
I sure do. If my running of SF/SG/SH and beyond got many of my engines to 200k and one to 300k, SL will do it with NO worries IMO.![]()
Sure, but if you can find the SM/GF-4 version for about the same price, why not use the potentially better oil?
In any event, the main point of my post was that SL oils aren't necessarily better just because they have a little more ZDDP in them.
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427,
But I think you'd agree that SL Havoline is a excellent oil when its under $1 a quart?![]()
I sure do. If my running of SF/SG/SH and beyond got many of my engines to 200k and one to 300k, SL will do it with NO worries IMO.![]()
Sure, but if you can find the SM/GF-4 version for about the same price, why not use the potentially better oil?
In any event, the main point of my post was that SL oils aren't necessarily better just because they have a little more ZDDP in them.
What are the differences between SL and SM oils beside the lowering levels of ZDDP and maybe even moly?