How often should I change the oil if I'm using this one?

With full synthetic oils, I change the oil every 8000 miles.

What country is this brand oil made?

The oil is made in Jeffersonvile, IN.

Is this safe for a rotary engine? Specifically a older FC.

Idemitsu makes oil specifically for the rotory engine. They specialize in it.

What is the difference between the gf5 and gf6. if there is any?

The earlier response is absolutely incorrect. This is from the same organization that defines GF series of specifications. ILSAC GF-6, a new lubricant specification is released by the ILSAC (International Lubricant Specification Advisory Committee) in May 2020. As the successor of the ILSAC GF-5, the GF-6 will be a new industry standard and will be backwards compatible with the previous standards. This means that a GF-6 oil can be used in an engine that previously was using a GF-5 oil, as the GF-6 is simply a higher standard for the oil’s properties. However, much older engines may not be compatible with newer oils. The benefits of the new standard is that it will ensure that the oil aids the engine in providing better fuel economy and less smoke emissions. As OEM requirements for more robust oils to protect their latest engine designs, along with a need for lubricants to offer a greater contribution to fuel economy are two of the key performance requirements that were highlighted in the ILSAC Needs Statement for GF-6. GF-6 oils are also expected to improve wear and deposit control of the engine, as well as protect against timing chain wear. Finally, oils that are GF-6 standard provide more protection against LSPI (Low Speed Pre-Ignition). This is where most consider and make the mistake of thinking GF6 is specifically for LSPI. There are a few differences between regular pre-ignition and low speed pre-ignition. Pre-ignition is when the gasoline/air mixture prematurely ignites without a spark from the spark plug. It is often recognizable by a “knocking” sound in the engine, particularly during the acceleration phase. The choice of engine oil or lubricant was never thought to affect this phenomenon or alleviate it in any way. However, low speed pre-ignition occurs in small, highly turbo-charged engines at low revolutions and heavy loading. It produces a “screaming” sound and is often very damaging or even fatal to the engine. Unlike pre-ignition, there seems to be a relation with the composition of the used lube oil, wherein the Calcium derived from the detergents present in the additive package seems to play a major role. Oils that comply with the new ILSAC GF-6 specification are meant to prevent this from occurring. However, as it's just 1 benefit out of many - using this in non-turbo engines is perfectly fine and is even recommended to move from GF-5.

Viscosity	5 sae_grade
Brand	Idemitsu
Vehicle Service Type	Car, Truck
UPC	810041470065
Automotive Fit Type	Vehicle Specific Fit
Manufacturer	Idemitsu
Size	5-Quart
SAE J300 Viscosity Grade	5W-30
Model	Idemitsu 5W-30 SP/GF-6 Engine Oil
Item Weight	9.3 pounds
Product Dimensions	11.8 x 8.4 x 4.7 inches
Item model number	30013015-95300C020
Manufacturer Part Number	30013015-95300C020

Full Synthetic 5W-30 Engine Oil SP/GF-6-5QT

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