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10-12-2015, 02:44 PM | #23 | |
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It might be safer to assume the first number in the rating (0W- or 10W-, for example), which is the equivalent cold weather SAE rating, would blend more predictably. But again, there would be no guarantee of the final outcome without getting some info from the oil manufacturer or some independent testing outfit. I would imagine that the oil companies aren't that keen on folks concocting their own blends and would prefer they stick with established products. |
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10-12-2015, 04:25 PM | #24 |
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Not sure about m1 but I spoke with Redline and they said mixing their 5w50 and 0w40 was absolutely fine and would yield exactly what you think as far as vis
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10-12-2015, 04:34 PM | #25 | |
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I'd imagine Redline 5w50 would be equivalent to BMW 10w60 as Redline always tend to have higher viscosity than most other oils at the same weight rating. I ran Redline 10w60 and wouldn't run it in the M3 again. It's super thick and makes the car feel sluggish compared to Castrol TWS.
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10-12-2015, 04:52 PM | #26 |
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True, although the RL 5w50 is a bit thinner (20 vs 23@100c). I went with 7 qrts of 0w40 and not quite 3 of the 5w50...wanted to go just a little thicker to see how the engine responded. Will probably go 50/50 in summer.
Last edited by Doc Oc; 10-13-2015 at 11:30 AM.. |
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10-12-2015, 07:42 PM | #27 |
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Why not just go with 5w40 in that case? Given uncertainties around required or optimal viscosities, it seems a little odd to try and fine tune the viscosity so closely.
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10-12-2015, 10:07 PM | #28 |
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Couple reasons. I had access to 8 free qrts of 0w40 and 2 free gallons of the 5w50. The 50 is nearly as thick as tws so I didnt want to run it straight in the winter and 0w (or 5w40) alone isn't a big enough viscosity change from the 5w40 I've been running to suit my needs, so when Redline said it was the same oil I figured why not experiment? Redline 40 is already about 10% thicker than other oils, but I wanted to go a little thicker still, without sacrificing cold flow much. I'm trying to determine if a viscosity change has any bearing on my cold start chatter issue but also wanted something a little thicker than a 40 wt at temp to see if it'd reduce the engine noise that got worse when I put in the pu euro 5w40.
Last edited by Doc Oc; 10-12-2015 at 10:24 PM.. |
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10-13-2015, 09:43 AM | #29 | |
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10-13-2015, 11:41 AM | #30 |
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Initial impressions are good btw. Haven't had the cold rattle since switching (doesn't mean much yet, only 3 cold starts in) and the engine is noticeably quieter. The mechanical noises that were very obvious after a long run with the pu 5w40 are, so far, much reduced. Of course the redline hasn't sheared yet so we'll see how it sounds in a few thousand miles.
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10-13-2015, 12:28 PM | #31 | |
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PU Euro 5w40 HTHS: 3.88 RL 0w40: 4.0 RL 5w40: 4.4 RL 5w50: 5.0 A 50/50 mix of 0w40 and 5w50 puts us pretty close to 5w40. Understood that you already had 0w40 and 5w50, and we might argue it could cold flow better than straight 5w40, so not pushing back on your decision. I'm probably looking for similar results to yours, and been strongly considering using RL 5w40 and going from there. |
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10-13-2015, 12:49 PM | #32 | |
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10-13-2015, 03:40 PM | #33 | |
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10-13-2015, 05:16 PM | #34 |
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Funny thing is I looked at a few voa's on the 5w40 and some showed a shit ton of moly while some had none. Any idea if they had a formula change?
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10-15-2015, 12:44 AM | #36 | |
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The moly level in the ES 5W40 is 120ppm, the 5W40 600ppm." Without knowing more about the no-moly UOA's, it impossible to conclude more. |
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10-15-2015, 01:20 PM | #37 | |
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http://www.bobistheoilguy.com/forums...Number=1264593 http://s140.photobucket.com/user/saa...copy2.jpg.html
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2008 dct coupe, evolve engine/dct tune, ttp, ms intake, megan exhaust, cf ds. Sold. Last edited by Doc Oc; 10-15-2015 at 01:32 PM.. |
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10-15-2015, 01:24 PM | #38 |
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Refer to this VOA thread: http://www.bobistheoilguy.com/forums...40_Euro#UNREAD
David at Redline is correct on the formulation. If it was up to me, I run redline 0W40 year round since I'm in So. Cal. |
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10-15-2015, 04:25 PM | #39 | |
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11-02-2015, 09:03 AM | #40 |
Stop the hate, get a V8
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Especially without an oil pressure gauge.
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11-02-2015, 09:56 AM | #41 |
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I run RL 5w-40 (Regular, not Euro) in e46 M54B30.
Engine loves it, all year. For the 3 seasons e92 S65B40: RL10w60, with short OCIs. Overkill but they both purr like sewing machines right on startup. Mike Miller uses RL. By the way Group 5 is inherently multi viscosity without the need for VI improvers--- and hence more stable/ less shear. Hence preferred for aircraft. How this is called old tech makes me laugh ... While you guys buy the marketing of Exxon and RD Shell, or for that matter BP? Read up at RL's website.
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11-02-2015, 11:42 AM | #42 | |
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11-02-2015, 02:19 PM | #43 | |
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Last edited by Doc Oc; 11-02-2015 at 05:09 PM.. |
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11-02-2015, 03:01 PM | #44 |
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