Mercedes-Benz Forum banner


2188 Views 6 Replies 5 Participants Last post by  MorrisTigerson69
what are the advantages and disadvantages of using 15w50 motor oil? I've got a 1989 560SEC with about 30,000 miles on it.
1 - 1 of 7 Posts
True, the wider the range (low number is low temp, high number is high temp), the more polymers are added.

So a 0W-50 oil would have all polymers! 10W-40 is pretty good year-round oil. The "10" means it works well in low temps, and the "40" means it goes up farily well to high temp. But it is still a compromise.

Since most of us change oil frequently, better to choose the right weight for the season/temp, and your driving style.

So for winter/low temps you want a "thinner" oil that will do a good job of lubricating cylinder walls and not get thick/sludgy in the low temps. So I go with 5W-30 for cold areas.

For summer, get something like 10W-40, so the "40" means the oil is "thcker" and will not thin out and possibly bubble under high temps.

For very cold, look at oil with a "0" on the low range number. For very high temps, or track use, look for something with a "50" on the high range number.

See less See more
1 - 1 of 7 Posts
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.