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10:47:20 - 04/25/2024
V6 Dakotas
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paul
Dodge Dakota
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4/25/2003
19:35:27
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 Subject: high mileage synthetic oil?
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Any thoughts on putting red-line synthetic 10-40 in a 3.9 with 210k ? Gonna smoke? Or gonna last to 400k???
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QckSlvrDak
Dodge Dakota
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4/25/2003
20:08:13
|  RE: high mileage synthetic oil?
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If there are any little holes that have been pluged from grime then the synthetic will probably find them and leak. This is not for certain but I have seen it happen. If you haven't had any problems then stay with what you have been using.
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Latifah - 3.9
Dodge Dakota
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4/26/2003
01:33:09
| RE: high mileage synthetic oil?
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I switched my 93 Dakota to Mobil 1 synthetic at about 100,000 miles and later to Royal Purple synthetic. At 132,000 miles, I have yet to have any leaks. I am a firm believer in synthetic oils.
With 210,000, I would recommend that you use Valvoline MaxLife for a few changes before using synthetic. It will clean your engine and if any leaks show up, it will then help condition the gaskets and swell them. I have had very good results with MaxLife.
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AmsoilSponsor
DakotaEnthusiast
4/26/2003
15:12:25
|  RE: high mileage synthetic oil?
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I am going to recommend 100% Synthetic Oils, and if you have to ask why then you should read information on the benefits of synthetics on my website, or from some of my posts on this website.
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To answer your "leak" concern ... Synthetic lubricants do have an inherent detergency that cleans and removes conventional motor oil deposits left over in an engine. However, motor oils are designed to help swell seals slightly to prevent leakage. The only time you would observe seal leakage is if the seals are already damaged or showing signs of leakage around them. As long as the vehicle has been well maintained, and in good mechanical condition, it can be switched to a synthetic lubricant at any mileage.
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A "100% True Synthetic" is Group IV/Group V and "Hydrocracked (not 100%) Synthetic" is Group III (still better than straight dino). A "true 100% synthetic oil" uses either the Group IV or Group V basestock, or a mixture of the two. As a matter of fact, I don't think any of the synthetics use just one, they mix them both. Group IV is PAOs (Polyalfaolefins) while Group V is the esters.
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There are other 100% synthetics than the one's I will mention below, but not as readily available, and i mention these three because they are the "favorite" 100% true synthetics on this website:
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Redline is an excellent synthetic oil, but VERY pricey (currently about $10 or more per quart), and they offer no Preferred Customer Program whereby customers can receive approximately 20% off retail pricing (Amsoil does). Redline has an excellent additive package.
Of course I am particular to Amsoil. Amsoil has a 30 year history, mountains of data to back up their claims, an excellent additive package, and offers extended drain intervals. Amsoil is currently priced below Mobil1 as of now, so it has an excellent price/performance ratio.
Mobil1 is good for an "on-the-shelf" synthetic oil, but it could be better. My brother-in-law owns two dealerships in Europe and the European Formulation for Mobil1 there is much better than the U.S. Mobil1 Formulation. It is a weaker formulation in the U.S. to compete price-wise with the other "on-the-shelf" oils.
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Others will post after me, since this is a hot topic (third only to politics and religion) ...
Last but not least ... Don't forget to use the best filtration ... Dirt is Enemy # 1.
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HIGH MILEAGE OILS
A recent issue of Lubes-n-Greases had a article on the high mileage oils and Valvoline (holding 80% of the High Mileage Oil market) attributes them to "padding their bottom line quite nicely". They "DID NOT" mention the benefits of using such a product but they sure were pleased with the results of the marketing.
For high mileage vehicles that have not been maintained well, or there is no way to determine how they were maintained, I might consider using these oils. I think the best thing about them is that they are thicker oils, so instead of being like most Xw-30 oils which are thin 30wts, these are on the high end. Perfect for aging engines. And the added esters do help a little bit. And, I do believe the high mileage oils are better if you want to do 5k mile drains instead of 3k, since they are usually "hydrocracked" semi synthetic oils technically.
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Steven Roark , Amsoil Dealer , Proud Sponsor of www.DodgeDakotas.com
AMSOIL Synthetic Motor Oils, Lubricants, Filtration, and Truck Care Products
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Tom Mize
Dodge Dakota
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6/05/2003
21:18:52
| RE: high mileage synthetic oil?
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What he said!!!!! I 2nd that statement!!!!
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