AutosBay:
Mobil lubricant XHP use either 10w-30 or 20w - 50 grades.

Something similar has been discussed here https://www.nairaland.com/1054692/knowledge-101-which-engine-oil

https://www.nairaland.com/208151/sienna-jenju-what-best-oil

nurey:
The recommended engine oil of that car is 5W30 api sj clearly printed on the engine cover while the recommended ATF is Dextron III also clearly written on the dip stick. I doubt if you would see any 5W30 in filling stations what you will come across is 10W40 or 5W40 there were only 4 filling stations I found this Total, forte oil, MRS and mobil and those engine oil grade are expensive close to 10k.

I bought MRS full synthetic 5W40 API, SJ five litres around August last year and am still using it now with 6xxx km (not miles) already covered and the oil is still same golden colour, I intend to use it for a year or 8xxx which ever comes first it is sold for 6,600 but you can get the mile master @ 6k from konga which is rated at 5W30
my brother inlaw uses the Mobile 0W30 and 5litres of that cost close to 10k all this versions are the Nigerian own not imported.

lomomike:



Read your owners manual, you'll discover it has genuine toyota type T-iv. My 2003 HL 2.4L 4sp AT/w OD says dextron iii on the ATF dip stick, but in the manual it categorically stated Type T-IV. I've followed www.Toyotanation.com well enough to read thru where folks used other oil other than type T-IV, it locked up their tranny.

Export1:
Toyota’s Stance on Synthetics

Toyota has these recommendations for synthetic oil:

Only Toyota vehicles in which 0w-20 synthetic oil is required (except for the 2TR-FE & 3UR-FBE Engines*) have been approved for extended oil change intervals of 10,000-miles/12-months. (However, you should continue to check the oil level regularly and top off if needed. That will help your engine get the full benefit of synthetic oil.)
Vehicles in which 0w-20 is an option to 5w-20 mineral oil, (or 5w-30), will continue to require 5,000-mile/6-month oil change intervals, even if 0w-20 oil is used.
In the case of vehicles with 10,000 mile oil change intervals, the 5,000 mile service interval has not been eliminated. The traditional 5,000 mile maintenance procedures (such as tire rotation) will continue to be required, and the fluid levels (such as brake fluid) will need to be checked and adjusted at this time.
If the vehicle operation meets the standard criteria for “Special Operating Conditions” such as: driving off-road, on dirt roads, towing a trailer, making repeated short trips under 32˚ F, or extensive idling; the engine oil must be replaced at 5,000 mile intervals, regardless of what type of oil is used.
*The 2TR-FE (4Runner / Tacoma) and the 3UR-FBE (Flex Fuel Tundra / Sequoia) are the exceptions to this new change interval program; these engines have not been approved for the 10,000 mile interval at this time. A 5,000-mile/6-month oil change interval is still required for these vehicles. Also, the Flex Fuel 3UR-FBE requires a 2,500 mile interval when operated on E85.

To recap, the decision to use synthetic isn’t black and white. You should take care to read and understand this choice prior to opting for it.

http://partsblog.olathetoyota.com/4541/synthetic-oil-toyota/

Lordscrown:
Thanks. For the contribution,but...Chie!!!am so confused now,don't know which advice to go for.its 1999 model.please am confused completely.

nurey:
The recommended engine oil of that car is 5W30 api sj clearly printed on the engine cover while the recommended ATF is Dextron III also clearly written on the dip stick. I doubt if you would see any 5W30 in filling stations what you will come across is 10W40 or 5W40 there were only 4 filling stations I found this Total, forte oil, MRS and mobil and those engine oil grade are expensive close to 10k.

I bought MRS full synthetic 5W40 API, SJ five litres around August last year and am still using it now with 6xxx km (not miles) already covered and the oil is still same golden colour, I intend to use it for a year or 8xxx which ever comes first it is sold for 6,600 but you can get the mile master @ 6k from konga which is rated at 5W30
my brother inlaw uses the Mobile 0W30 and 5litres of that cost close to 10k all this versions are the Nigerian own not imported.

lomomike:


WTF! Are you serious or joking?

Why do you want this OP to use this heavy oil and ultimately crash his engine?
If you don't know somethings, let it slide, yet be patient to observe and learn more.

Op, your best recommended oil is SAE 5W30 SL grade of synthetic blend oil.

For your tranny, toyota recommends you use Genuine Toyota ATF type T-IV atf oil.

In the ATF can check for either this JWS3309 or NWS6500.


DON'T use any other ATF other than that which I mentioned or else, GOBE!

nurey:
The recommended engine oil of that car is 5W30 api sj clearly printed on the engine cover while the recommended ATF is Dextron III also clearly written on the dip stick. I doubt if you would see any 5W30 in filling stations what you will come across is 10W40 or 5W40 there were only 4 filling stations I found this Total, forte oil, MRS and mobil and those engine oil grade are expensive close to 10k.

I bought MRS full synthetic 5W40 API, SJ five litres around August last year and am still using it now with 6xxx km (not miles) already covered and the oil is still same golden colour, I intend to use it for a year or 8xxx which ever comes first it is sold for 6,600 but you can get the mile master @ 6k from konga which is rated at 5W30
my brother inlaw uses the Mobile 0W30 and 5litres of that cost close to 10k all this versions are the Nigerian own not imported.

IdaraCHODB:


I think that unless there is evidence of an engine or transmission transplant what is written on the engine oil cover or dip stick should prevail over the manual,

it is easy to replace the manual that came with the vehicle with another that looks similar but might have been made for a different run of the same vehicle

nurey:


I have answered your question B4 mind you if you use the 20W50 that is common your check engine light would surely come on move to the odyssey sienna thread and ask me question I will do my best to give you detailed answer.