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As reported on Business Insider:”
AAA found that synthetic engine oils performed an average of 47 percent better than conventional oils in a variety of industry-standard tests,” said John Nielsen, AAA’s managing director of Automotive Engineering and Repair.” (Business Insider)
You should use whatever is recommended by the car manufacturer.
Even if there’s something better than what they recommend?
In most cases, the manufacturer knows the car better than you. They have no incentive to give you bad recommendations.
Yes they do.
I drive an older car. At my last oil change, they told me not to use synthetic oil as it’s bad for my car.
If you use synthetic oil make sure to carry a spare quart or two in your trunk.
In 2004 I flew to Nashville to drive back a car I bought for my then college age daughter. The dealer sent it out for an oil change to one of the national chains and they put in full synthetic oil. Unfortunately they put in 5 quarts, not the 7.5 required for this model.
Driving back on the Blue Ridge parkway in a small Virginia town the oil light went on. The only gas/convenience store did not stock synthetic oil. I had to put in 4 quarts of regular 5W30 brand name oil. When I hit the first medium size city with a dealer for that car, I stopped for service. Because I had mixed regular oil and fully synthetic I had to have the entire oil system flushed and a new filter. It was not cheap.I had the car filled with a synthetic blend per the service manager’s recommendations. We run all of out vehicles on the blend with no performance issues. I know if I get stuck needing oil late at night or in the middle of nowhere I can mix regular oil withouy causing damage or having to flush the system.
Synthetic oil is not acceptable in Chanukah menorahs.
(cont.) Please confirm this with your own mechanic.
CTLAWYER, props for trying to help, but you may have been misinformed. Mixing oil types (synthetic, blend or regular) is not a problem at all. There are some engines that manufacturers recommend use synthetic oil, but even those won’t be contaminated or damaged by mixing in some regular.
If you mix regular into synthetic, you are lowering the level of protection from pure synthetic to somewhere between pure synthetic and pure regular; i.e. you have created a blend. If the synthetic is diluted enough, you may want to drain it and refill with pure regular, but you certainly shouldn’t need to flush the system.The last sentence above should be “If the synthetic is diluted enough, you may want to drain it and refill with pure SYNTHETIC, but you certainly shouldn’t need to flush the system.”
sorryRed…this was confirmed with the chief mechanic at Jaguar. Having driven Jags for more than 45 years I can tell you that they are different from typical US/Japanese/German cars.
I have copies of the Jaguar service bulletins that say if you add more than 2 quarts standard oil to the synthetic you must flush the system and change the filters, also the bulletin that says you can run synthetic blend oil.
Back in 2004 that Jag was about $50K. It’s still running strong, driven by my youngest daughter.
I’ll continue to follow Jaguar’s service advice.
Retirement is around the corner and the next Jag I buy may be my last new car purchase…I’ll continue to follow their advice. We’ve been keeping the cars an average of 20 years, with the exception of Mrs. CTL’s original 1971 V12 E Type Convertible which we still drive each summer, 46 years of trouble free use.CTL, since your advice seems only to apply to Jaguars, it’s probably irrelevant to all CR denizens other than you.
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