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Old 04-01-2009, 11:29 AM
uberpanzer44 uberpanzer44 is offline
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Mein Auto: X5
Smile 4.4i oil weight and brand recommendation for max performance

I am looking for recommendations on oil weight and specific brands that have shown to improve engine performance and/or fuel economy (hopefully both) in the X5 with 4.4i engine.

I live in Central Florida, warm most months, very little or no cold weather operations.

My initial thought is Mobil 1 European Formula in 0W-40 weight, based on what I have read in other posts.

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Old 04-01-2009, 09:32 PM
jcl10 jcl10 is offline
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If you don't have cold weather, you don't need the 0 weight. If you are concerned about fuel economy, you wouldn't want to go heavier than the 30 weight recommended by BMW. Why not stay with the 5W-30 Castrol that BMW use?
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Old 04-04-2009, 09:04 AM
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dcharnet dcharnet is offline
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I generally agree with the prior post, assuming that you are not doing things like heavy towing in hot weather, in which case a higher viscosity synthetic might provide more thermal protection and be somewhat beneficial. These are not race cars, after all, where a small amount of HP lost to the increased internal friction of heavier oil might make some difference (in my relatively low HP vintage Formula Vee, the difference between a 30-weight race oil and a 10-50 MIGHT be 0.5 HP or so at max HP--150 more RPM on the back straight at Road America, if I am in a draft). All of this is really de minimus for road use with an X5, and I can't imagine that you would ever notice any difference except possibly in mileage. I presume that friction loss due to heavier oil might negatively impact gas mileage somewhat. CAFE politics was probably a factor in BMW's recommendation of 5-30. My focus with oil choice for the X5 is engine protection on start-up and during high-temp stress like towing a trailer. There may be something to gain in "peformance" in chipping or air intake/ exhaust mods, but I am not sure, and be aware of possible warranty breach issues.
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