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    Run Extra Guard for 10k or Ultra Guard for 20k?

    I'm trying to decide if I want to run an Extra Guard 4967 for 10k miles or Ultra Guard for 20k miles on my 2.5L Camry. I run 10k OCI. I've had no issues so far running an Extra Guard on this car for 10k. What would you guys do?
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    Can I top off a diesel with gasoline oil?

    Would you feel comfortable topping off a diesel engine with gasoline oil? I've got a 6.7L turbodiesel in my 2021 F-250. It takes 13 quarts of diesel oil, but I've only got 12 quarts of T5 10W-30 on hand. Is there any reason I shouldn't be able to use gasoline oil for that final quart...
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    2019 HRV with R18z engine and 30 weight oil?

    I've got a 2019 Honda HRV with the R18z 1.8L naturally aspirated engine. I've found both the US and UK owners manuals and have included snippets of the oil weight recommendations of each. The US manual calls for 0W-20 and only 0W-20. The UK manual states that 0W-20, 0W-30, and 5W-30 can be used...
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