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Originally Posted by davestlouis
I did the first oil change on this car since I bought it, and I'm nervous about something...
the PO used 10w40 Havoline and Fram filter at an unknown change interval. The pressure gauge would read "3" at speed and under load, and fall to right around 2 at idle or coasting
I filled it with 15w40 Delo and a Wix filter today, in 60 degree weather. The pressure gauge pegged at 3 and stayed that way until I got the car up to temp, then it only fell to 2.5 at idle or coasting. . . .
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Hey, Dave,
My previous Benz was the W126 420, and I used that same oil (though with a Mann or Knecht filter). On my earlier changes down here in NO -- hot climate, and that's putting it mildly -- I'd used 20W50, and had a hot pressure at idle of 1.8. When I went to 15W-40, which you'd think would be thinner, my oil pressure settled at 2.2.
The 15W-40 Delo is one of the super-dino oils, with extra additives to handle diesel contaminants. It does fine on a gas engine like the M116. As long as your gauge pegs at 3.0 when you start the car cold, and rises from that idle setting to 3 when you pass about 1500 rpm, you're OK.