Discussion Starter · #1 ·
Being new to Mn, I needed to get good info on the best type of oil to run. So since I had gotten so much conflicting info I decided to ask Random since I trust his opinion greatly.
Here is the letter I sent him
Here is the letter I sent him
and his reply[body]"Kirk Luedtke" <[email protected]>
12/07/2002 08:56 AM
To <[email protected]>
Subject Hey Random
Sorry to e-mail you an automotive question, I know how annoying it can get. It is just that I get conflicting advice from people I trust quite well on what types of oil I should run for winter. Since I trust your advice quite well and you know the Mn winters I figured you could probably help me out.
My 240sx has just over 100,000 miles on it. Should I switch to synthetic for the winter or should I just run 5w? Is there any problems going back and forth from regular to synthetic and back to regular after the winter?
I don't mind the added cost of the oilchanges if I should just run synthetic year round especially since I don't drive much. (Less the 1000 miles a month) so an extra $10 to $20 a month for oilchanges isn't a problem.
One last question so I don't have to ask you later. When I finally get my engine swap done (hopefully when the snow thaws), will the same princeples apply to the turbo charged sr20det?
Thanks in advance,
I hope this helps some of you out that were wondering the same thing.[body]For MN winters, I reccomend synthetic. At -20...convential motor oil turns semi-solid...almost like toothpaste. Even a 5W-30.
I would NOT reccomend that you switch back and forth between conventional oil and synthetics.
If you can find a good, premium conventional oil that doesn't solidify up at -20 or -40...then it's worth a try, but then you're looking at nearly as expensive as off the shelf syntheic...if not more expensive.
In "normal" climates, I have no problem reccomending "conventional" oil for folks. Even for folks who drive their cars hard. But for the extremes in MN (hot summer, cold winter) or extreme heat of the desert southwest, I only reccomend Synthetic. The synthetic's ability to stay viscous at very cold tempatures, not sludge up at very high temps, plus be "usable" at all ranges in between make it ideal.
If you go synthetic...stay synthetic. If you find a good premium conventional oil...stick with it. As long as your car starts in the cold...that's what counts. To be honest, I have no "proof" for my belief of "stay sythnetic or stay conventional" when it comes to oil. I do know of people who had oil consumption problems after using conventional oil for 50,000 or more miles, who then when to synthetic. The oil consumption did eventuall drop down to "normal" levels, but it is something to watch out for.
For the project motor, I would run conventional oil for the first 5000 miles. I would do the following oil changes.
15 Minutes of idling (enough to bring the engine/coolant/fluids up to temp)
Then switch to synthetic if you wish.
For a turbo, I would reccomend 15W-50 synthetic in summer and 5W-50 in winter (hard to find). The high temps around the turbo bearings really kill oil. You need the highest temp oil you can get (nearly) to make sure that coking is kept to a minimum. For turbos...I just don't trust Conventional oil. hell...with Hyundai's HLA's...I just don't trust conventional oil!
Leave it to Random to needlessly complicate everything