blending of castrol oils with different grades

[dnomyar]

Good Day Fellow Tsikoteers...just wondering if it's ok to mix Magnatec SAE 10-40 with GTX 20-50, although parehong Castrol ito. Nanghihinayang kasi ako sa reserve kong 3/4 liter na 20-50. Due for change oil na ako this month and parang gusto ko na bumili nang 3 liters magnatec then idagdag ko na lang half liter ng GTX. Wala bang masamang epekto sa makina pag ginawa ko ito? Ang old reliable service ko ay Feroza 99 model.

Thank you.

[BKR5]

As long as it states in the bottle that it is compatible with other oils then it is okay to mix the two.

[dnomyar]

Thanks a lot BKR5...it is assuring to hear sound advice from knowledgeable and credible source.

[shadow]

minimal lang naman ang magagastos mo sa isang extra liter na magnatech eh. bumili ka na lang ng 1 gallon magnatech, huwag mo na ihalo magkaiba ang viscosity eh

[dnomyar]

Sabagay, P299 lang naman sa Ace hardware. Alternate ko na lang next year na palit ng oil. salamat ng marami sa reply!

[niky]

That's nothing... I mix different blends of synthetic and non-synthetic all the time... when I'm nearing the oil change and the oil gets a bit low, I sometimes top off with a different brand.

[burjegol]

an oil is an oil. as long as the indicated Sp. Gravity falls within the engine's spec, it is ok to mix them. it will still lubricate your engine.

[shadow]

Yeah but why do that? it's not like you will spend an arm and leg to buy 4 liters of same viscosity oil.

[box_type]

follow up question, how long should we store the leftover oil before it can be considered as not suitable for use anymore?

[dnomyar]

i read somewhere that as long as moisture doesnt sets up into the oil, it will last. so the oil is as good as long as the container does not rot or fail....my two cents worth...

[burjegol]

Yeah but why do that? it's not like you will spend an arm and leg to buy 4 liters of same viscosity oil.

Baka nanghihinayang sa sobrang oil? OK that does not cost much but if you can utilise it, why not? I've been doing that in the land rover service vehicle the company had provided me previously. The engine is consuming oil (about a liter a week), and it is a much hassle to go to transportation to ask for a refill. since we have capella oil aplenty (refrigeration compressor oil), I just refill it to capacity weekly till the time it will be PM-ed (monthly). It has no adverse effects on the engine for 5 years, till the time the vehicle was deemed beyond economical repair (body and others but not the engine).