![]() ![]() I would love to try out Redline in my Firebird sometime, but it's price is far too high up here. I also think that this Formula SLX is very similar to Amsoil 5w30, their viscosities at 40 and 100c are very close for one. I think the bonus is that Formula SLX appears to hold it's TBN very well, and it's lack of moly might be a benefit for extended drains. Also, the Formula SLX appears to be very shear stable so far too. For one, they both contain a lot of esters. One of the reasons I like the Castrol Formula SLX 0w30 is that I see it as being very similar to Redline in many ways, but with a few extra benefits too. For extended drain applications in normal driving, I believe Amsoil or Mobil 1 are better choices for most folks. It is also a good candidate for problem engines like the V-6 toyota and 2.4L Nissan four cylinder that tend to beat up the oil and form sludge/varnish deposits. These include application like wet clutch motorcycles and turbos that tend to shear oil. I think Redline is well suited to specific applications where it's unique properties can be put to use. I think the very high level of moly is somewhat responsible for this.Ģ) Below average TBN retention makes the product unsuitable for extended drain use in many cases.ģ) Basestock and additive chemistry is pretty unique, so you really want to carry some on long trips if your engine burns oil.Ĥ) Cost/Availability - of course you can say the same for the Amsoil Series 2000 formulations. I believe the additive chemistry is highly resistant to corrosive wear.ġ) Soft metal wear - the additive chemistry is pretty aggressive and Pb/Cu/Sn levels tend to be higher than for other top tier synthetics. You can see this in the oil analysis results, if you know what to look for.Ĥ) "Hard" metal wear, specifically iron wear is generally very good. ![]() This is a function of the relatively high, HT/HS viscosity and very low Noack numbers.ģ) Excellent engine cleanliness, even compared to other synthetic lubes. If you look at the spec sheets, it's easy to figure out why.Ģ) Grade for grade, lower oil consumption than Mobil 1 where this is an issue. Here's my take on Redline, based on the results I've seen to date and a fair amount of experience with synthetic lubes:ġ) Probably the best shear stability of any multrgrade I've seen - even the 5w-40 and 10w-40 grades simply don't shear.
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