I've seen TriSynthetic 5w30 oil reports in the past where it thinned out to 9.1 or 9.2 cst in less than 5000 miles. The SuperSyn 5w30 seems to be more stable though.quote:
Originally posted by metroplex:
Patman: M1 5W-30 is 9.7 cSt @ 100C. I wonder how much it would thin out after 7500 miles.
You keep posting this same nonsense even after folks tell you that it's simply WRONG. Motorcraft 5w20 has always been made by Conoco, and it has ALWAYS been a blend of Group II and Group III. Ford never made any switch from "dino" to a blend. They merely decided to market the Motorcraft oil as a blend because of the Group III component of the base oil blend. Conoco, on the other hand, does not market its Hydroclear 5w20 as a synthetic blend even though it's the exact same oil.quote:
Originally posted by metroplex:
Jay: "Ford approval" ? ROFLMAO
Ford decided to switch to a synth blend 5W-20 because dino 5W-20 couldn't handle normal use!
It seems to me that what we are seeing is car makers who produce cars/engines that they expect to be driven hard (and possibly in amateur competition) are going to recommend heavier oils than 5w20. We've seen this with BMW requiring 10w60 Castrol for the M3, when other models come with 5w30. This does not mean, IMO, that 5w20 won't provide adequate protection under normal conditions, it's just not the ideal grade for high performance engines that are tuned to run on the edge.quote:
Originally posted by Idrinkmotoroil:
Metroplex, I am starting to agree with your opinion on 5w-20 weight, I was beginning to think the 20 weights may hold their own in newer engines but couple things are making me think twice.
Firstly I checked all my engine clearance specs in my shop manual on my 2002 Honda Civic k20a3 engine and compared them to a 99 Honda Civic Si b16a engine. All but two clearance specs were identical between the two vehicle engines. The only clearances that were tighter were piston to pin clearance and pin to rod clearance, thus the piston pin is tighter to the piston and rod. All other major items such as pistons and bearings were identical clearances. One engine used 5w-30 oil, the 2002 calls for 5w-20 oil. So that argument about tighter engine clearances doesn't wash with me.
Secondly, Ford doesn't recommend 5w-20 oil in the Focus SVT engine, but they do in their lower performance Focus cars. Acura RSX-S requires 5w-30 oil and the base Acura RSX calls for 5w-20 oil. We see the higher performance engines on these two cars calling for thicker oil. Ford went so far as listing in a technical service bulletin.
Seems like enough evidence to me to keep using 5w-30 oil and forget about a few tenths of mpg.
Ahhhhh, Toyota.....fine car. My family had one about 1974-1984. I was a zit-faced teenager then, but I loved it, just loved it. None of this wonderful synthetic Amsoil, Aral, Fuchs, Castrol, Schaeffer in those days. Every 6 to 8 months, we just handed it over to the grease jockey at the local gasoline station and said, "oil change." Never knew, never cared what the guy poured into the engine. Ditto for the oil filter.quote:
Originally posted by jc1990:
yes the corrala was driven mostly highway as he had a package delivery company and by 1996 when we got rid of the car it still ran great the carberator was starting to go but it had origanil clutch starter alternator radaitor best car i ever had just wish my 97 pontiac was half as good that has to be about the worst car i have owned