best synthetic oil and m/t oil??

[daf62757]

Originally Posted by The Sin

I recently started a new job as a courier. I drive about 10,000 miles a month. I'm getting my oil changed every two weeks. I want to make the switch to synthetic. I'm thinking of going with Amsoil SAE 0W-30 Signature Series. According to the manufacturer, I can go 25,000 miles on each oil change. Does anyone have any input on this? Anyone else travel high miles like me? If so, what do you use? When I make make the switch, should I do a flush? I have just a little over 50,000 miles on my 2010 Yaris.

You might be past the point of no return with respect to regular oil. I tried to switch my step daughters car over to pure synthetic and it resulted in oil leaks. The syn oil is so thin it seeps between the seals. Her car had over 100K miles so maybe yours is not too far gone. You can use the high mileage oil with is 50/50 regular and syn.

You can try 100% syn and see if it results in oil leakage. If not, go for it.

I personally use Mobil 1 0w20 and change at 10K. I have almost 60K and never had any problems.

AMSOIL is very expensive! You can usually buy Mobil 1 at Advance Auto on sale and get 5 quarts and an oil filter for around $25. After four or five of those, you have enough left overs for a free oil change.

[lenzomaru]

I would like to use syntec oil, but as a way to save money as this will extend my oil change time, i currently change my oil at 5000km (dusty roads,day temp avg 31 deg c) with syntec i believe i can go for 10,000 saving me money for oil filters and also time (as i change oil myself) My yaris takes a little under 4 qts of oil

- 4 qt of castrol 10w 30 dino oil is $30 US
- 4 qt castrol 10w 30 full syntec $53 US

Since i'll be doing 2 dino oil changes in the same amount of time (10,000km) i'll have to buy 8 qts dino oil totaling $60 US as compared to $53 US for the full syntec during the same period (10,000) also i will have to purchase and extra oil filter ($20US) and my time to change it.

so the syntec works out for me

[lenzomaru]

Switched to Amsoil 10w 30 full syntec two days ago in my yaris sedan and my wife told me that the yaris is "driving dead"...Anybody know what maybe causing this ,, i used regular dino Castrol oil before, with no problems. I switched to syntec to save some $$$ since it increases my oil change interval.

Should i leave the syntec in my car? or drain out and go back to dino?

[tmontague]

Originally Posted by lenzomaru

Switched to Amsoil 10w 30 full syntec two days ago in my yaris sedan and my wife told me that the yaris is "driving dead"...Anybody know what maybe causing this ,, i used regular dino Castrol oil before, with no problems. I switched to syntec to save some $$$ since it increases my oil change interval.

Should i leave the syntec in my car? or drain out and go back to dino?

Not too sure what she means by "driving dead". When I changed to syn I noticed easier starts and smoother engine function (noise, feel, vibration etc). I just use Canadian tires Formula syn oil which is very cheap on sale. Removed my valve cover last night to replace the seal and at 138000km it look ridiculously clean and brand new. No dark oil build up any where. I change it every 8-9000km depending on if I'm doing more city driving or not and the temperature.

[Hershey]

I used 5w-20 and 5w-30 Shell synthetic due to quieter engine , especially on interstate . That oil was less than $3 a quart . Also used Pennzoil Platinum at times . I think the Canadian tires Formula synthetic is SHELL . I've posted used oil analysises for the Yarises we had .

[tmontague]

Originally Posted by Hershey

I used 5w-20 and 5w-30 Shell synthetic due to quieter engine , especially on interstate . That oil was less than $3 a quart . Also used Pennzoil Platinum at times . I think the Canadian tires Formula synthetic is SHELL . I've posted used oil analysises for the Yarises we had .

Yes, i've read that a few times as well, ct's formula syn is made by Shell. It's not a pure syn oil but the price is awesome on sale and my engine looks brand new inside so I'll stick with what seems to be working and is economical. Plus the winter start ups are much easier. Although i'm adding a block heater this summer.

[sheekeebut]

Originally Posted by Hershey

I used 5w-20 and 5w-30 Shell synthetic due to quieter engine , especially on interstate . That oil was less than $3 a quart . Also used Pennzoil Platinum at times . I think the Canadian tires Formula synthetic is SHELL . I've posted used oil analysises for the Yarises we had .

Have you used or analyzed Mobil1 5W30 or Castrol Edge 5W30?

[Hershey]

Originally Posted by sheekeebut

Have you used or analyzed Mobil1 5W30 or Castrol Edge 5W30?

Sorry , no , just the SHELL and Pennzoil . Using Mobil1 A.F.E. 0w-20 in a '13 FIT . No U.O.A.s for that yet .

[Hershey]

Originally Posted by Thirty-Nine

Been running Mobile 1 since nearly day one. Just purchased some Redline 75w90 GL-4 for the trans. Need to install it. I just put the Redline in my Suzuki and it shifts very nicely.

The MT90 is a great improvement for shifting . No clunk into reverse , notchiness or grinding . Would not advise a GL-5 for any Toyota manual tranny . Tried a MOBIL1 gear oil all the issues described and got worse . Drained it and put in the MT90 . Problems gone .

[UberSilver]

I'm posting in this very old thread because I believe that better oil is more critical on our older engines. I'm one of those people that drive my cars until they are totalled or so tired that they must be put down.

I've run synthetic oils for a very long time. When I was a kid I started to use synthetic in my air cooled motorcycles. At the time(mid 70's) the only brand making synthetic was Mobil1.

So for decades I was a big fan of Mobil1 oil. In the last few years I've seen more poor results in the form of UOA's for Mibil1 than ever before.

If you need a cheap synthetic oil, I say the Penzoil Platinum has taken to top spot from Mobil, as far as popular store bought brands. The UOA's show this to be the case.

For some time now I've been using Royal Purple and find it to be far superior to the more easy to find Synthetics.

If you buy RP in a 5-gallon jug, it can be had for under $7. per quart.

My 1.5 liter loves the stuff, and revs smoother with RP, than with any other oils I've tried.