Quote:
Originally Posted by Chris F.
Cetane doesn't have anything to do with lubricity, which should be your primary concern with the Bosch fuel pump that is used in todays diesels. Bosch designed the pump with euro specs in mind, and US diesel fuel has lower SCAR ratings than Europe due to our low sulfur fuel (thanks EPA)
Having said that, the Bosch pump really needs fuel with a higher lubricity (SCAR) rating.
This has been talked about ad-nausem in the diesel truck world, and it will apply to the X5 as I believe it uses the Bosch CP4 fuel pump.
I highly advise using Opti-Lube XPD. It is one of the best lubricity additives available, and also is a CETANE booster and contains anti-gel for the winter. You can search online for more information on it.
Chris
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This post should be STICKIED - Opti-Lube has great proven lubricity ratings for all its products -
XPD is the one you want to use "all season", here in the South where our temps rarely get low enough to need the Anti-Gel, I keep a quart of XPD on hand during winter, and I use a combinaton of their Summer formula (higher cetane boost) and the XL (most lubrication and deposit control) -
Use it every tank, it will save your fuel pump - and please change your fuel pump more often than BMW's recommended 33,000 miles, and prime the fuel pump when you do change it (scarring it on a dry start WILL damage the fuel pump)