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trust me this is not a smart remark either but you don't know as much about oil as you think.

another thing to consider is that VERY, VERY few engine problems can be attributed to oil. more often than not it's oil delivery problems and/or improper assembly craftsmanship.

last i researched shell still had a decent amount of ZDDP in it.

oil quality would be low on my list of factors when diagnosing a failure

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