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Engine oil grades
Getting ready to change oil and filter for the first time in winter here. This time of year, the temp. can range from 15F to 70F. According to my 1985 owners manual, my choices for this temp. range are:
15w-40 15w-50 20w-40 20w-50 SAE-30 10w-40 10w-50 Any input to help narrow that down some or brand selection would be appreciated. Thanks, Mark
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85 300D (California) 220k 03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada) 03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico) Diamondback hybrid Element skateboard(mileage unknown) Good news for diesel owners...There's no such thing as cold...only the absence of heat! "Beer is proof that God wants us to be Happy." Benjamin Franklin "Possession....the King of sin." The Avett Brothers |
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Here we go again, another oil thread.
Do you want to use synthetic or conventional?
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'81 MB 300SD, '82 MB 300D Turbo (sold/RIP), '04 Lincoln Town Car Ultimate Sooner or later every car falls apart, ours does it later! -German Narrator in a MB Promotion Film about the then brand new W123. |
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Conventional. I spent about 30 minutes searching for a thread that had an answer that would definitely apply to my situation. I apologize for starting another oil thread since I know there are many. If it is that painful...don't reply.
Mark
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85 300D (California) 220k 03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada) 03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico) Diamondback hybrid Element skateboard(mileage unknown) Good news for diesel owners...There's no such thing as cold...only the absence of heat! "Beer is proof that God wants us to be Happy." Benjamin Franklin "Possession....the King of sin." The Avett Brothers |
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i am running 15w40 right now...winter temps range from 5F to 35F...15w40 might be a bit thick for these temps thou....
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Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#5
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15W-40 is probably OK for those temperatures. However, if the engine has less then perfect compression or the valves need adjustment or the starter is not perfect, then you will get some starting problems. In such a case, it's time to switch to 10W-40.
Or, switch to synthetic and then you don't need to be as cognizant of the thickness of the oil. You can go 5K on synthetic. It's a bit more costly, but, not significantly, when you take the filter into account. |
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Quote:
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
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Quote:
Before I switched to synthetic, I would run Castrol 15W-40 year round in the W123. It never failed to start, although it really preferred the block heater below 15°F. It almost stranded me in Cincinnati with a bad glow plug. Almost ran out of juice before it finally crawled up to an idle. |
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I agree 15W40 should be OK for your climate if everything is in good shape. If you do decide to go to synthetic, the Mobil 1 5W40 is impressive in cold temperatures, but expensive (I just paid $5.99/quart locally).
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5k on synthetic
is very appealing. However, there is no way I will do 5k in 3 months. I know that 3mo. is a good time to change w/ conventional...Does the same hold true for syn.?
__________________
85 300D (California) 220k 03 Silverado 1500 Xcab Z-71 Guzzler 90k Real American steel(made in Canada) 03 Suburban 1500 4x2 Guzzler 170k Real American steel(made in Mexico) Diamondback hybrid Element skateboard(mileage unknown) Good news for diesel owners...There's no such thing as cold...only the absence of heat! "Beer is proof that God wants us to be Happy." Benjamin Franklin "Possession....the King of sin." The Avett Brothers |
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Run 15w-40. I have 15w-40 Delo in the SD now and I notice that until about 20 degrees it is fine. She cranks a little slower but thats ok and I just let it warm for a few minutes. When the temp's drop into the teens or single digits it cranks much slower but still starts.
fyi Walmart 15w-40 diesel oil is like $5 a gallon. I do not plan on switching this car over to synthetic because I plug it in I don't really need it. I'd rather use the $30 that I save to buy a lifter for the SDL.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
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Quote:
http://www.mobiloil.com/USA-English/MotorOil/Car_Care/AskMobil/Recommended_Oil_Change_Intervals.aspx |
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