02-10-2019, 12:56 AM | #21 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: 30w oil
I do understand the W for a 10W40 multi viscosity oil, 10W is for Winter.
I thought when you are talking about a single oil like the old SAE 30 ford oil, it was called weight. 30 weight, oil that is not modified. If not referred to as weight what is the proper term for it? |
02-10-2019, 11:05 AM | #22 | |
Senior Member
Join Date: Jun 2015
Location: Red Deer, Alberta
Posts: 5,043
|
Re: 30w oil
Quote:
According to: https://www.usclimatedata.com/climat...tates/usmi0220 It doesn't even normally get down to 10°F in Dearborn in the winter, so 20W is fine if one lives in that region.
__________________
If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn! |
|
Sponsored Links (Register now to hide all advertisements) |
|
02-10-2019, 01:54 PM | #23 | |
Senior Member
Join Date: Aug 2015
Location: Southern Alberta
Posts: 582
|
Re: 30w oil
Quote:
|
|
02-10-2019, 02:25 PM | #24 |
Senior Member
Join Date: Jan 2019
Location: Germany, near Aachen
Posts: 1,156
|
Re: 30w oil
Gasoline engine oils from API SC upwards contain additives that attack non-ferrous metals (bearing bronze) and white metals in the plain bearing shells of the crankshaft and connecting rod. Therefore it is better to use API SC.
This has nothing in common with the viscosity! But the large tolerances of old engines always need a relatively thick oil. Multigrade oil is good. But not with too low base viscosity! Every oil - even multi-range! - becomes thinner with increasing temperature. A multigrade oil only becomes "slower" thinner. Therefore, 10W-XX is less favorable for these engines than 20W-XX. I worked as a consultant in the lubricants industry and have my own mix: SAE 25W-50 in class API SC.
__________________
Beste Gruesse aus Deutschland, Werner Ford Model A, Roadster, 1928 Citroen 11 CV, 1947 Hercules W 2000, 1976; (with NSU-Wankel Rotary Engine), Canadian version |
02-10-2019, 03:22 PM | #25 | |
Senior Member
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,779
|
Re: 30w oil
Quote:
Before the addition of the"W" designation, oil was catagorized by its SAE number (usually abbreviated as No.). For example, S.A.E. 10 or No. 10, etc. The term "straight" was also used; as in "Straight 10". As refining methods improved, it became possible to produce an oil that had identical hot viscosity as No. 10 oil, but would flow at a lower temperature than 10. S.A.E. created the "W", or "Winter" designation (10W, 20W, 30W, etc.) for these oils. You can find charts online that give the temperature ranges for each viscosity. |
|
02-12-2019, 01:15 PM | #26 |
Senior Member
Join Date: Aug 2015
Location: Southern Alberta
Posts: 582
|
Re: 30w oil
Sponsored Links (Register now to hide all advertisements)
|
02-14-2019, 01:38 PM | #27 |
Senior Member
Join Date: Oct 2012
Location: Whangarei, New Zealand
Posts: 298
|
Re: 30w oil
Wear happens with cold, thick oil.
At no point in normal operation will a 0W-40 get thinner than the SAE40 - they are both the same viscosity when hot, which is when they are the thinnest. They BOTH thicken as they cool. A 0W-40 works better than a SAE40, because it thickens less when cold - they're both as thin as each other when hot though. The difference is that the 0W will flow better cold, giving the best of both worlds. It's a somewhat moot point though - not too many people are going to pay for 0W-40 and dump it every 1000 miles though! Ours usually runs a 15W-40, more for cost/availability than anything. How many model A owners even drive enough miles for the oil to impact the engine longevity anyway???
__________________
Allan '29 Tudor, Canadian RHD Whangarei, NZ "Duct Tape can't fix stupid, but it can MUFFLE the sound" |
02-14-2019, 01:47 PM | #28 | |
Senior Member
Join Date: Aug 2018
Posts: 2,332
|
Re: 30w oil
Quote:
x2 - You did a much better job of describing what I was trying to say. |
|
02-14-2019, 01:49 PM | #29 | |
Senior Member
Join Date: Apr 2013
Location: Northwest CT
Posts: 1,092
|
Re: 30w oil
Quote:
If they both flow like SAE 30 when hot (which they should), why would oil consumption change? |
|
02-14-2019, 02:43 PM | #30 |
Senior Member
Join Date: Jul 2018
Location: Dallas, TX, Angola, IN
Posts: 157
|
Re: 30w oil
Shell Rotella SAE30
|
02-14-2019, 06:44 PM | #31 | |
Senior Member
Join Date: Aug 2015
Location: Southern Alberta
Posts: 582
|
Re: 30w oil
Quote:
most common sense answer ever, put into words all can understand. |
|
|
|
Sponsored Links (Register now to hide all advertisements) |
|