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I was meaning more "independant" tests of Castrol Syntec. BMW also uses Mobil1, but do these oil makers GIVE BMW the oil for free to say they recommend it? You never know, these days!
I hope that Mobil-1 make the 5W-20 available soon for 5.7Liter Hemi's. The SRT-8 6.1Liter Hemi engine pics shows Mobil-1 as the "Recommended Oil".
Ahaaa!!! Factory fill with Mobil 1, so much for "break in " using regular oil as we have discussed Corvette, MB, BMW et.al. What happend to all that yang about piston ring seal yada yada yada blah blah blah. I was at AZO today scoping out oil and plastic primer, clearcoat for my splash guards.Who knows what fully or 100% synthetic means. Seems obvious. I will be changing out that Amsoil reformulated "synthetic" crap before cold weather sets in. My 5w30 Amsoil says 100% syn, 5w20 XL does not. What's in a label, Castrol and Mobil 1 labels say 100% syn, Penzoil does not say on the label. As it stands now, I will either go with M1 or Syntec and Castrol has the required 5w20 it gets the nod.
I was meaning more "independant" tests of Castrol Syntec. BMW also uses Mobil1, but do these oil makers GIVE BMW the oil for free to say they recommend it? You never know, these days!
Yes you never know, I was suckered into Amsoils 5w20 fake synthetic. They do make an excellent real 5w30 synthetic. The Amsoil has independent data on thier website if you can trust that, ironically thier oil comes out on top. Irony can be so ironic sometimes. Most of us know people with 200K+ on thier cars without Nancy Boy synthetics,fancy schmancy magnets, or super deluxe filters and thier cars are running great. Deep down for the length of time most uf us will keep our cars none of this which brand or which type will really matter. True, syn is superior in every respect except cost but does that translate into better longevity or even MPG, no proof. Over 100K the cost is about $250 more to run syn, well worth it for superior protection and theoretical longevity.
Yes you never know, I was suckered into Amsoils 5w20 fake synthetic. They do make an excellent real 5w30 synthetic. The Amsoil has independent data on thier website if you can trust that, ironically thier oil comes out on top. Irony can be so ironic sometimes. Most of us know people with 200K+ on thier cars without Nancy Boy synthetics,fancy schmancy magnets, or super deluxe filters and thier cars are running great. Deep down for the length of time most uf us will keep our cars none of this which brand or which type will really matter. True, syn is superior in every respect except cost but does that translate into better longevity or even MPG, no proof. Over 100K the cost is about $250 more to run syn, well worth it for superior protection and theoretical longevity.
Well said. I have been pouring through the synthetic oil data all weekend, and basically, it comes down to that the AMSOILS and others all sounds great, if you can find them, and want to pay $8/qt for them. But none of us are going to go the recommended 25,000 miles between changes that AMSOIL recommends, so why not spend half the money and get superior protection for 6,000 miles! I just choose not to be that anal.
Keep in mind, once you use synthetic, you must continue to do so. I of course use it in my Vette and it is good peice of mind knowing that you have the added protection of synthetic oil.
Keep in mind, once you use synthetic, you must continue to do so. I of course use it in my Vette and it is good peice of mind knowing that you have the added protection of synthetic oil.
Actually, from what I've been reading, I don't think that is the case...
Keep in mind, once you use synthetic, you must continue to do so. I of course use it in my Vette and it is good peice of mind knowing that you have the added protection of synthetic oil.
not sure about that, some time ago (months, at least a year), i asked castrol about switching from oil to synthetic and vise-versa. according to castrol you can switch to and from without fear.
Well said. I have been pouring through the synthetic oil data all weekend, and basically, it comes down to that the AMSOILS and others all sounds great, if you can find them, and want to pay $8/qt for them. But none of us are going to go the recommended 25,000 miles between changes that AMSOIL recommends, so why not spend half the money and get superior protection for 6,000 miles! I just choose not to be that anal.
Because I live in a very hot environment, we change our oil every 3,000 miles. With synthetic, we can get away with changing every 10,000 miles.
Also, my husband says once you go with synthetic that you cannot go back to organic oil. Synthetic oil does not get the acidic changes that you will find with organic oil, which can cause pitting in the engine. (something I learned in organic chemistry in college.....I don't remember much else)
Because I live in a very hot environment, we change our oil every 3,000 miles. With synthetic, we can get away with changing every 10,000 miles.
Also, my husband says once you go with synthetic that you cannot go back to organic oil. Synthetic oil does not get the acidic changes that you will find with organic oil, which can cause pitting in the engine. (something I learned in organic chemistry in college.....I don't remember much else)
i would NEVER go 10k before changing oil. mine is and always will be 3k-4k never longer. we are talking about $40 oil change to a 3 or 4 thousand dollar engine. (in fact after oil change if you listen very closely, you will hear a very faint "thank you".
Last edited by james jefferson; 08-29-2004 at 09:55 AM.
Reason: additional thought
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before cold weather sets in. My 5w30 Amsoil says 100% syn, 5w20 XL does not. What's in a label, Castrol and Mobil 1 labels say 100% syn, Penzoil does not say on the label. As it stands now, I will either go with M1 or Syntec and Castrol has the required 5w20 it gets the nod.
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