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What's the issue you have with Euro oil?

Because AC removes humidity and cools the air. Works great here in SC. Phoenix doesn't have a humidity problem which makes conventional AC inefficient. It's why AC has a condenser water drain. Swamp coolers put humidity into the air.

Umm, I'm with Z. None

Use it up and then move to M1 0w-30 ESP.

I would have stayed with the ESP.

Looks like renewable energy is working out well in OZ.

When I lived in Phoenix, AC was useless but we had a swamp cooler on the roof that worked out great. Do they still have swamp coolers in Phoenix?

Run a chase or tap through the plug hole first. May save your but. Worked for me.

KYB's on everything I own. Yea they ride stiff. Just the way I like it.

Do a compression test and/or leak down test to get an idea of how the cylinders are doing.

Really? I thought that was for filled for life?

Yup. 4.0L

My XJ only held 4 quarts. With filter.

Personally, I don't use diesel oil in a gas engine. If it's a diesel rated oil.

What does the service manual recommend?

At operating temperatures, it's a 40 grade.

I would take it back to have corrected.

Sorry about that but you wanted the best...

When was the last time the O2 sensor was changed? They usually start getting sluggish or quit after 120k miles for heated sensors.

M1 FS Euro 0w-40 year round