Mobil Highmileage ok?
06-24-05, 12:21 PM
#1
Mobil Highmileage ok?
i just bought a box of Mobil Highmileage 10W-30 for my 91 N/A that has 92K on it. its this a good oil to use or is there something better? it is also NON- synthetic. ive heard that synthetics can leave ash and residue in the chambers.
06-24-05, 01:14 PM
#4
****** of the Engine Swap
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i use 10w-30 in the winter and 20w-50 in the summer (i think!) castrol non sythn. From what I've heard synthetic is okie if its Royal Purple because it burns so cleanly, but not the others.
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06-24-05, 01:40 PM
#8
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Originally Posted by rcjunkie
Just a quick note about high mileage oils. DO NOT USE them unless you need to. High mileage oils contain seal swelling additives and once you go to a high mileage oil, you shouldn't go back to a non-high mileage oil. I would only use a high mileage oil if I had significant oil consumption issues or seeping seals.
As for synthetic or nonsynthetic oil, synthetic are not worth it since you can't take advantage of their main benefit-extended oil change intervals. A decent Group III base oil-not a try synthetic but a hydrocracked oil like ones found in Castrol Syntec or Mobil 7500 or Rotella T should be sufficient and not set you back too much money. True synethics such as Royal Purple, Mobil1 etc..which are PAO and Ester based (group IV and group V basestocks respectively) are not cost effective unless you are racing.
As for synthetic or nonsynthetic oil, synthetic are not worth it since you can't take advantage of their main benefit-extended oil change intervals. A decent Group III base oil-not a try synthetic but a hydrocracked oil like ones found in Castrol Syntec or Mobil 7500 or Rotella T should be sufficient and not set you back too much money. True synethics such as Royal Purple, Mobil1 etc..which are PAO and Ester based (group IV and group V basestocks respectively) are not cost effective unless you are racing.
06-24-05, 02:30 PM
#9
hmmm....well i guess ill just give the box to my friend. havent used it yet, thought id ask first. whats a good brand, not royal purple i cant get my hands on it too easily around here. i would like to go with the most regular oil i can. my 7 burns oil just as a great running rotary should so i dont need anything special.
06-24-05, 06:22 PM
#10
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High Mileage oils of any brand contain additives that help stop oil leaks by swelling oil seals. I personally wouldn't use this type of oil unless I had an engine (rotary or piston) that leaking or consuming excessive amounts of oil. Once you swell a seal with with a seal swell additive you can't really go back to a "regular" oil because the seal will shrink back to less than its original size.
06-24-05, 07:51 PM
#11
Former Moderator. RIP Icemark.
Originally Posted by homebrewer
High Mileage oils of any brand contain additives that help stop oil leaks by swelling oil seals. I personally wouldn't use this type of oil unless I had an engine (rotary or piston) that leaking or consuming excessive amounts of oil. Once you swell a seal with with a seal swell additive you can't really go back to a "regular" oil because the seal will shrink back to less than its original size.
06-24-05, 08:48 PM
#13
Rotary Freak
i have a 89 t2 i am doing a oil change and wanted to know which oil is good to use i cant afford the royal purple or redline so what would you's suggest and what weight for summer time
06-24-05, 08:58 PM
#14
Passing life by
Originally Posted by 91mazdarx7
i have a 89 t2 i am doing a oil change and wanted to know which oil is good to use i cant afford the royal purple or redline so what would you's suggest and what weight for summer time
