5 qt Royal Purple + K&N oil filter = $40
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UOAs are car specific but a good oils will report a good results more consistently than bad ones. UOAs are good to see what you specific engine's health is and if you are a good candidate for extended oil change intervals. If your engine is trashing the oil in 3,000 miles, you aren't going to be able to get 7-8k out of it.
Researching UOAs on the same engine with different oils is good in regards to what the lab techs comment about the oil and how the TBN's live within the mileage duration. In general terms.
Castrol Edge is marketed to be superior to Castrol syntec. One would have to go to the maker's site to see. Dig around bobistheoilguy forums to see how the Edge is performing on other's OUAs.
Researching UOAs on the same engine with different oils is good in regards to what the lab techs comment about the oil and how the TBN's live within the mileage duration. In general terms.
Castrol Edge is marketed to be superior to Castrol syntec. One would have to go to the maker's site to see. Dig around bobistheoilguy forums to see how the Edge is performing on other's OUAs.
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Red Card Crew
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The Gold versions are confirmed made by Wix. Not sure about the silver. So make sure it's the Napa Gold models. Also buying them from Napa is expensive. www.fleetfilters.com. I need to order more and will probably add the cabin and air filters to the order. I think the filters are less than $5 each on this site. Way better than the $7+ at Napa?