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- Jan 20, 2022
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- 93
Your over thinking this way to much. That engine will be fine from a redline 20wt. All the way up to a Motorex 10w-50. Simply use common sense on how u plan on using said equipment & pour 🛢 accordingly
You do realize Outlaw Race cars, running pure Alcohol(fuel dilution) don't even use 15w-50.California. I think the colder I've seen where I live was in the 40F.
A specific oil was used for the break-in (SAE 30). The blend is for everyday usage moving forward. The engine was built to be dual purpose (road & track) with reliability as the main goal. I haven't had a chance to talk with the builder yet about what kind of oil he recommends on the track.
So my understanding without going into specific numbers is that the goal would be to have a thicker oil than regular 0/5/10W40 and thinner than 15/50? Is there a gap in between that isn't filled by other specialty oil on the market?
I called Driven Racing Oil the other day out of curiosity. Based on the clearances I gave them, they recommended running their 5W40.
That's not really relevant. GM has required 15w-50 for the Corvette for track use, Ford spec'd 5w-50 for the Track Pack version of the Coyote as well as the Ford GT, BMW spec'd 10w-60 for many of their M engines for years, and Ferrari also spec's 10w-60.You do realize Outlaw Race cars, running pure Alcohol(fuel dilution) don't even use 15w-50.
This is correct.
And the wear tests are included in SAE J300.
A 10w-60 is irrelevant pure marketing, just like Dad's Motorex 10w-50. Right now, I got him using SAE 40 Tug Boat motor oil in the crankcase & he don't even know it.☠2019 KTM 500 Exc-f 6,000 miles/ 325 hrs. He would freak if he knewThat's not really relevant. GM has required 15w-50 for the Corvette for track use, Ford spec'd 5w-50 for the Track Pack version of the Coyote as well as the Ford GT, BMW spec'd 10w-60 for many of their M engines for years, and Ferrari also spec's 10w-60.
Since the OP is running an LS7 (Corvette engine) the range of viscosities being explored seems appropriate with the builder basically spec'ing an xW-40 at the heavier end of the spectrum.
More stout that wither not blended?M1 0W-40 and 15W-50 mixed 50-50 is a mix I've seen here and elsewhere. Should be pretty stout.
I'd personally just run M1 5W-50.
Not really, it's a factory spec'd visc for several engines and its development and use have an extensive history. This is similar to the Corvette program using M1 15w-50, there's a lot of history there.A 10w-60 is irrelevant pure marketing, just like Dad's Motorex 10w-50. Right now, I got him using SAE 40 Tug Boat motor oil in the crankcase & he don't even know it.☠2019 KTM 500 Exc-f 6,000 miles/ 325 hrs. He would freak if he knew
Well said. One of my favorite members. Never negativity, just logical, useful information. Thank you for that OVERKILL.Not really, it's a factory spec'd visc for several engines and its development and use have an extensive history. This is similar to the Corvette program using M1 15w-50, there's a lot of history there.
We are of course talking about an LS7 Corvette engine in this thread, not a KTM bike, my reason for bringing up Ford and BMW is that they are also producing automotive engines where they spec heavier viscs for certain performance variants of their engines where track use is likely.
As has been explained several times, oils are blended, and tested, to meet a variety of performance targets, many of which have formal approvals. The chemistry of a mix is not validated in that manner and may produce undesirable results in terms of performance in certain areas.I always wonder why the concern of mixing oils.
Idk about stout. Weaker or Stronger, depending on your perspectiveMore stout that wither not blended?
We all know there is no such thing as a 7.5w-45 oil. I stated the mix would result in something like a 7.5w-45 (if it did exist) and is only a way to compare.No you can't. You just made up two grades that don't exist in J300:
The oil, at 50/50, would have the following characteristics:
KV40: 93.58cSt
KV100: 15.19cSt
VI: 172
That makes it an xW-40, likely a 10w-40, though it may squeak in as a 5w-40.
Also, playing home chemist without any lab equipment means you have no idea what characteristics of the lubricant you've now compromised over each of the fully formulated products on their own.
Weaker than 15W-50 and stronger than 0W-40.More stout that wither not blended?
No, that's just silly. There are oils with the proper grading designation all over that spectrum. As I noted, Mobil 1 High Mileage 10w-40 is right at that viscosity (15.3cSt). These are RANGES, so trying to conjur up some fantasy "in-between" grade doesn't make sense, nor does it help the OP understand the system that assigns them. It also doesn't address the problem that the Winter rating doesn't just scale like KV100/KV40. That's why I posted J300, actually did the math, and then showed him an existing product that's right at the visc target his builder was shooting for.We all know there is no such thing as a 7.5w-45 oil. I stated the mix would result in something like a 7.5w-45 (if it did exist) and is only a way to compare.
Engines, generally, are incredibly tolerant of a wide range of viscosities. Approvals set a floor for acceptable performance in many important areas, none of those are anecdotal about "running better than new" but based on actual wear performance, deposit prevention, oxidation resistance...etc. Scientifically defined and validated parameters.Say what you want about my methods but my vehicles' engines speak otherwise. They all run better than brand new.
MIX 50% 0w-40 / 50% 15w-50 | Mobil 1 High Mileage 10w-40 | Mobil 1 FS X2 5w-50 | |
KV40 | 93.58 | 101 | 104.3 |
KV100 | 15.19 | 15.3 | 17.1 |
VI | 172 | 179 |
VI of the HM 10w-40 is 160 (VI is just a calculated value based on KV100 and KV40).This thread is a wealth of information, thank you all for contributing!
At this point, a couple of elements are pretty clear:
- mixing oil is fine on paper, although, without a proper rigorous testing methodology, there's no way to know if it does provide any benefit over using one specific oil
- the "mix" of these two oils create a blend close to the Mobil 1 High Mileage 10w-40 in terms of KV40/100
MIX 50% 0w-40 / 50% 15w-50 Mobil 1 High Mileage 10w-40 Mobil 1 FS X2 5w-50KV40 93.58 101 104.3KV100 15.19 15.3 17.1VI 172 179
One thing that's interesting is some of you mentioned going with a 5w-50. With that oil though, we're further from the mix as calculated by @OVERKILL as shown above (I couldn't find the VI for the 10w-40).
Since the 50/50 mix and the Mobil 1 10W-40 KV100 viscosity is basically the same, I'd just run the 10W-40 since you're in CA and don't have to worry about super cold start-ups. Why complicate it by mixing oils.This thread is a wealth of information, thank you all for contributing!
At this point, a couple of elements are pretty clear:
- mixing oil is fine on paper, although, without a proper rigorous testing methodology, there's no way to know if it does provide any benefit over using one specific oil
- the "mix" of these two oils create a blend close to the Mobil 1 High Mileage 10w-40 in terms of KV40/100
MIX 50% 0w-40 / 50% 15w-50 Mobil 1 High Mileage 10w-40 Mobil 1 FS X2 5w-50KV40 93.58 101 104.3KV100 15.19 15.3 17.1VI 172 179
One thing that's interesting is some of you mentioned going with a 5w-50. With that oil though, we're further from the mix as calculated by @OVERKILL as shown above (I couldn't find the VI for the 10w-40).
if op just ran a regular xw-40 or a 50w, dont think the cst is that big of a difference.That's not really relevant. GM has required 15w-50 for the Corvette for track use, Ford spec'd 5w-50 for the Track Pack version of the Coyote as well as the Ford GT, BMW spec'd 10w-60 for many of their M engines for years, and Ferrari also spec's 10w-60.
Since the OP is running an LS7 (Corvette engine) the range of viscosities being explored seems appropriate with the builder basically spec'ing an xW-40 at the heavier end of the spectrum.