Synthetic vs Conventional
10-19-2009, 10:13 PM
#12
Retired Aerospace
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Fwiw:
I use synthetic lubes in the engine, tranny and differential. Both my vehicles have the same engine/tran combo: 4.6L/AODE/4R70W. I use Wal-Mart Supertech 10W30 full synthetic in the engines, Chrysler ATF+4 in both trannies and the differentials are loaded with Valvoline 75W140 GL6.As far as oils are concerned any good grade/brand of API SM classification will give long engine life, either synthetic or natural, as long as service intervals are reasonable. I do the 3K/6month routine. Motorcraft filters are the only ones allowed in my car and truck.
The Supertech oil is ideal for older engines since it has a seal conditioner built in to the additive package. It has improved oil consumption in my '94 LTC considerably.
The trannies love ATF+4. The old AODE (161K miles) performs flawlessly with firm but smooth shifts and not a hint of TC clutch shudder. The 4R70W (125K miles) had been loaded with Mercon/Dexron III, but the shifts were rather harsh, particularly the 1-2 shift. Switching to ATF+4 has substantially improved shift quality, firm but smooth and, again, no hint of TC clutch shudder.
10-20-2009, 02:32 AM
#13
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I use synthetic lubes in the engine, tranny and differential. Both my vehicles have the same engine/tran combo: 4.6L/AODE/4R70W. I use Wal-Mart Supertech 10W30 full synthetic in the engines, Chrysler ATF+4 in both trannies and the differentials are loaded with Valvoline 75W140 GL6.As far as oils are concerned any good grade/brand of API SM classification will give long engine life, either synthetic or natural, as long as service intervals are reasonable. I do the 3K/6month routine. Motorcraft filters are the only ones allowed in my car and truck.
The Supertech oil is ideal for older engines since it has a seal conditioner built in to the additive package. It has improved oil consumption in my '94 LTC considerably.
The trannies love ATF+4. The old AODE (161K miles) performs flawlessly with firm but smooth shifts and not a hint of TC clutch shudder. The 4R70W (125K miles) had been loaded with Mercon/Dexron III, but the shifts were rather harsh, particularly the 1-2 shift. Switching to ATF+4 has substantially improved shift quality, firm but smooth and, again, no hint of TC clutch shudder.
. But I due stick to Motorcraft filters and there always cheaper than fram . I have high miles but if i ever rebuild my engine I will stick to Fully Synthetic. But when using Supertech I always make sure I change at 3,000 miles or 3 months.
10-31-2009, 06:16 AM
#14
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I'm using Royal Purple 5w30. I switched from Mobil 1 three oil changes ago. I've run synthetic since 3000 miles w/ no problems. I love the Royal Purple. It just feels like it pulls stronger. IMHO
12-13-2009, 08:20 PM
#16
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Making a Change:
I noticed recently that Wal-Mart's Supertech full synthetic does not anymore have a seal conditioner listed in the addivitive package. Wally might have switched suppliers and the product, though good, does not have what I want for my old vehicles. So, from this point on, my vehicles will get Mobil 1 High Mileage full synthetic that DOES have a seal conditioner listed in the additive package.
12-26-2009, 02:04 AM
#17
Fords For Life
I too use full synthetic Royal Purple and have never had a problem. I know a mechanic in a ford dealership and he says to ALWAYS use motorcraft oil filters something about back pressure that the other guys dont have so that shat I use and Im sticking to it. Use whatever you feel comfortable with after all its your truck and as long as your happy thats all that matters
12-27-2009, 01:32 AM
#19
Senior Member
12-27-2009, 01:31 PM
#20
Resident Dinosaur
