I drive two diesel cars and always brim both of 'em. Diesel fuel doesn't expand like gas. Just wait till the foam fades -- and top off.

I live in hot SoCal and have never had problems with either one. I also religiously record my mileage, and prefer the accuracy of full fill-ups.

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'91 300D 2.5 Turbo 330K
'00 VW TDI Golf, 190K
'67 BMW R50/2
'73 Norton Commando Interstate