Motor oil from an engineer who does his own analys
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Boat Maintenance
Forum Discription: Discuss maintenance of your Correct Craft
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=37524
Printed Date: November-16-2024 at 10:46pm
Topic: Motor oil from an engineer who does his own analys
Posted By: tryathlete
Subject: Motor oil from an engineer who does his own analys
Date Posted: October-15-2015 at 7:50pm
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I'm an advocate of synthetic motor oils driven by studies I participated in while an aviation maintenance student in the late 70's. I found this most interesting write up and motor oil analysis most intriguing. https://540ratblog.wordpress.com/2013/06/20/motor-oil-wear-test-ranking/ ------------- 2008 MasterCraft 197TT 1996 Nautique Super Sport 1988 Waterlogged Supra Mariah |
Replies:
Posted By: 8122pbrainard
Date Posted: October-15-2015 at 8:25pm
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Peter, https://540ratblog.wordpress.com/2013/06/20/motor-oil-wear-test-ranking/" rel="nofollow - Here's a direct link to the article Interesting conclusion that the ZDDP is a myth. He did do some testing but unless I missed it, the testing was all in the lab. I've seen real life examples of cam lobes worn down almost to round after the owner switched to modern synthetics thinking they were better. I also was in the metal stamping field from 1991 to 2012. During that time, we utilized 3 oil suppliers and all of them said there wasn't a substitute for ZDDP. I think I'll stick with the ZDDP oils for my vintage engines. I sure don't need any problems! ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: Hollywood
Date Posted: October-15-2015 at 11:37pm
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I got 99 problems but oil ain't one. VR1 is just fine |
Posted By: SNobsessed
Date Posted: October-16-2015 at 10:04am
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The guys sure likes to toot his horn! VR1 rated good, so no worries there. Some interesting snippets: "All oil bottles involved in the testing were thoroughly shaken before the samples were taken. This ensured that all the additive package components were distributed uniformly throughout all the oil in the bottle, and not settled to the bottom." So we should shake our engines because the additives settle out? Maybe just drive trailer on a rough road to the ramp? "found a wiped cam lobe and ruined lifter. There were metal particles throughout the entire engine, causing devastation which had damaged the rod and main bearings, the oil pump, and the crankshaft, thus requiring another very costly and time consuming total rebuild" This guy must have had a fram filter. How else did metal particles get into the bearings? ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: shierh
Date Posted: October-20-2015 at 10:43am
| My engine builder says use Rotella for this reason. |
Posted By: 8122pbrainard
Date Posted: October-20-2015 at 11:04am
Steve, And what is the reason? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
shierh wrote:Posted By: cadunkle
Date Posted: October-20-2015 at 7:46pm
What oils were used in those engines with failed cams? What were the cam specs or part numbers? Would be interesting to see how those oils rank on his test. If they are low, that would support his claim but if they rank high in his test it would discredit his claim. His tests seem to correlate with my experience of zinc content not seeming to have much correlation with failure rate of mild to moderately aggressive hydraulic flat tappet cams. I am considering changing some of my oil choices based on his tests (diesel oil in gas engines). |
Posted By: 74Wind
Date Posted: October-20-2015 at 10:51pm
A bit disappointed with the severe lack of detail in the attached report. How can you summarize such an elaborate subject into just the 10,541 paragraphs listed?  I have also been using Rotella with seemingly no ill effect, and based on many many prior threads, a common choice for many others as well. Paragraph #112,342,1 says not best for use in high-performance engines, however, would one really call this 41 year old engine of mine, also the standard F150 engine for decades, a high-performance engine? ------------- 1974 Southwind 18 1975 Century Mark II |
Posted By: Gary S
Date Posted: October-20-2015 at 11:12pm
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I would think that they did not test marine engines Jeff and believe a marine engine should be included in with high performance due to it's workload IMHO ------------- http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS 95 Nautique Super Sport |
Posted By: 74Wind
Date Posted: October-20-2015 at 11:36pm
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Good point. On reflection, not sure they actually qualify under the definition of high-performance, but as I don't recall regularly flooring the F150's I have had to high RPM's particularly under such sporadic marine use, they definitely qualify as high workload. ------------- 1974 Southwind 18 1975 Century Mark II |
Posted By: 8122pbrainard
Date Posted: October-21-2015 at 12:13am
2 cams were out of Hercules blocks and the 3rd was out of a SBC. Sorry but beyond that, I don't have any more information. ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Posted By: cadunkle
Date Posted: October-21-2015 at 1:24pm
Absolutely not high performance either in the general sense of HP per cubic inch or in the context of the article which is focused on how radical the cam is. Factory marine cams in these old low output engines (351w and 454, not sure about the earlier old technology engines) are hydraulic, low lift, with gentle ramps, low valve spring pressures, and low revving. Those are the factors most relevant for how this test measures oil film strength. It makes little difference to the cam if there's no load or immense load on the flywheel. The cam goes round and round with the same spring pressures exerting the same psi on the cam lobe. The important difference would be oil temperature relative to thermal breakdown of the oil where it presumably begins losing film strength. High RPM and load will drive up oil temperature potentially reducing film strength. Rotella (72,022 psi) or Rotella T6 (67,804 psi) have relatively low film strength, which works fine for a mild cam as the psi exerted on the cam lobe by the lifter is low as compared to an aggressive hydraulic cam or a solid cam. Suggest reading the diesel oil section of the article for more details on diesel engine oil requirements. I suspect my higher RPM big block with a high spring pressure, high lift, fast ramp rate cam requires more from the oil than my lower RPM diesel with low lift, low spring pressure, slow ramp rate cam that also has an oil cooler. |
Posted By: FredWSauer
Date Posted: November-06-2015 at 9:16pm
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I'd like to toss some fuel on this dead horse with no end! I saw at NAPA today a Mobile1 Syn 20W50 marked for Air cooled motor cycles.. It listed SG as one of the oil certs. My '93 lists SG as the recommended oil. Guy behind counter said SH oils were better or superseded the SG and that was for motorcycles only. But, this motorcycle oil has the SG and listed included zinc in the sales spif on the front. Seemed like a good fit! But, how do know if you can't apply science and I don't want my baby to be a test bench? ------------- - FWS 1993 Ski Nautique 1978 Glastron T-160 1994 Weeres Pontoon - Wife's Boat |
Posted By: TRBenj
Date Posted: November-06-2015 at 9:55pm
| Read the data sheet... That won't lie. |
Posted By: tryathlete
Date Posted: November-28-2015 at 1:40pm
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I'm still going to use Mobil 1 15W-40 since I can get it at WalMart cheap. I just don't feel that 5000 rpm's is all that tough on oil. 9000 RPM's on an S2000 Honda is another story. Those piston speeds scare me. ------------- 2008 MasterCraft 197TT 1996 Nautique Super Sport 1988 Waterlogged Supra Mariah |
Posted By: KellyfromVA
Date Posted: December-01-2015 at 9:18pm
And Rotella is widely used on diesel semi truck engines, not changed for over 50,000 miles. You wouldn't consider that severe service? ------------- 1980 Ski Tique |