I do want to take good care of the cars...but I know that there is only so much you can do.
I have seen posts in which someone has used BG44 and was advised by Terry Dyson to avoid this and stick to Redline SL-1.
I have also read posts in which the scavenging effect has been discussed
Here's the results of a quick search...sorry for the lengthy post
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http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=1;t=003195#000000
TooSlick
Member # 227
Here's my take on Redline, based on the results I've seen to date and a fair amount of experience with synthetic lubes:
Strong Points:
1) Probably the best shear stability of any multrgrade I've seen - even the 5w-40 and 10w-40 grades simply don't shear. If you look at the spec sheets, it's easy to figure out why.
2) Grade for grade, lower oil consumption than Mobil 1 where this is an issue. This is a function of the relatively high, HT/HS viscosity and very low Noack numbers.
3) Excellent engine cleanliness, even compared to other synthetic lubes. You can see this in the oil analysis results, if you know what to look for.
4) "Hard" metal wear, specifically iron wear is generally very good. I believe the additive chemistry is highly resistant to corrosive wear.
Weak Points:
1) Soft metal wear - the additive chemistry is pretty aggressive and Pb/Cu/Sn levels tend to be higher than for other top tier synthetics. I think the very high level of moly is somewhat responsible for this.
2) Below average TBN retention makes the product unsuitable for extended drain use in many cases.
3) Basestock and additive chemistry is pretty unique, so you really want to carry some on long trips if your engine burns oil.
4) Cost/Availability - of course you can say the same for the Amsoil Series 2000 formulations.
I think Redline is well suited to specific applications where it's unique properties can be put to use. These include application like wet clutch motorcycles and turbos that tend to shear oil. 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. For extended drain applications in normal driving, I believe Amsoil or Mobil 1 are better choices for most folks.
TooSlick
Member # 227
Jay,
Sort of a process of elimination I suppose ....
There is some sort of chemical reaction the first 1-2 times Redline is used where the basestock and/or additive chemistry interacts with these softer bearing surfaces and probably forms some a sacrifical metallic oxide layer. In cases where the drain interval has been overextended the bearing wear goes up noticably, so something is turning acidic and causing corrosive wear.
Of course, I could be totally wrong and it's the specific type of esters Redline uses that are causing this. That would be my other educated guess.
.............
MolaKule
Member # 59
quote:3) Excellent engine cleanliness, even compared to other synthetic lubes. You can see this in the oil analysis results, if you know what to look for.
I think the cleanliness AND the soft metals issue are one and the same. The DD levels are low for a synthetic oil and I believe it's because of the high ester content in RL, which make very good scavengers. I do not think the esters are attacking any soft metals, just cleaning the surfaces of bearings, due to their high polar affinity to metals.
I do agree that RL's tbn and tbn retention could be better given the price. I think their calcium levels need to be about 1.5 times more than current levels.
As far the cleaning effect/RL and softmetals - I really cling to my theory similarly when going to non-Mo synthetic from a high Mo oil - The AW plastizied films are removed from bearing surfaces by the new oil along with surface atoms -hence these show up as increased (soft) metals in UOA and decreased TBN (from the organo/thio) - This is temporary and not necessarily harmful, the new high priced oil will lay down it's own AW film when the cleaning "phase" is over.
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"But your analysis makes a good case that RL is taking a bad rap on its UOAs for doing a superb job of clean-up inside the engine and for laying down the all-important protective coat of moly."
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http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=3;t=000611#000000
Yes, nice report. Oil stayed in grade as it should! [Big Grin] Wear was pretty good too at around 1PPM per 1,000 miles. I've seen better iron and aluminum numbers ... but not in a turbo ... and you can't do too much better than 1PPM of lead after all that time. [Cheers!]
With a TBN of 5 you could go longer ... but I wouldn't, not too much unless you really don't care too much about the car.
I guess it's just my way of thinking. After 7,500 miles, that oil & filter really don't owe you anything. Going longer between changes is just asking for sludge/crud to build up and that's pricey and/or difficult to get rid of when it takes hold of a motor.
Best to drain and refill with fresh before you start to have trouble. [Wink]
--- Bror Jace
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http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=3;t=000238#000000
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http://theoildrop.server101.com/cgi/ultimatebb.cgi?ubb=get_topic;f=1;t=006165#000007
much as I love GC I can't dismiss the fact that he is so positive about this oil! [I dont know]
Terry (Dyson) has changed all his vehicles over to Redline, thats good enough for me, I'd take that over a UOA any day of the week.