15W40 Vs. 10W40 Pro's/Con's, Which ones BETTER? - PeachParts Mercedes-Benz Forum

trueog · #1 06-08-2006, 10:22 PM

Quote:

Originally Posted by page62

15w40 "diesel" oils tend to have more additives (like zinc) as well as more detergents. That's what makes them better. The 15w40 oils seem to make all Mercedes -- gas or diesel -- a little happier.

Down here, however, my 450SL prefers 20w50. It tends to find ways to leak 15w40 more readily in the heat!

which one provides better heat protection? and also why is 10W40 more cash?

deanyel · #2 06-08-2006, 10:43 PM

They're both going to be fine, stop worrying about it, just put some oil in the car. There's virtually nothing you could that would have any impact on the life of the engine.

EricSilver · #3 09-07-2006, 10:30 PM

Quote:

Originally Posted by trueog

which one provides better heat protection? and also why is 10W40 more cash?

It's not. The 15W40 comes in a 4-qt bottle (1 gal) and the 10W50 comes in a 5-qt, thus the price difference.

I found Castrol 15-40 today at WalMart. They call it "Tection" and it is labeled Diesel oil. I bought 2 gallons for about $8.50 each. (Walmart also has Shell Rotella and Mobil Delvac(?) in 15W40.

trueog · #4 09-08-2006, 02:38 AM

Quote:

Originally Posted by EricSilver

It's not. The 15W40 comes in a 4-qt bottle (1 gal) and the 10W50 comes in a 5-qt, thus the price difference.

I found Castrol 15-40 today at WalMart. They call it "Tection" and it is labeled Diesel oil. I bought 2 gallons for about $8.50 each. (Walmart also has Shell Rotella and Mobil Delvac(?) in 15W40.

In canada we have 5 litre 15W40's of castrol at Walmart for little less then $12... when everyone else sells 4.4litres at about the same price sometimes a buck or two more..Strange... 1 Gallon is 3.78 Litres.